Developers/Maintainers/en

<languages/> This page lists developers who know the most about, and help maintain, core MediaWiki components, key extensions and skins, libraries and other Wikimedia technical infrastructure.

Template:Import-stickytable

MediaWiki core

See also: Gerrit's list of mediawiki group members (core developers with +2 on all mediawiki repositories).

Component	Description	Steward	Individual maintainer	Consulted	Informed
API	MediaWiki's web-based "action" API that lets people interact with MediaWiki programmatically. Template:MaintainerLinksComponent	MediaWiki Engineering (MediaWiki Interfaces Team)	Legoktm
Authentication and Authorization	Components related to user authentication and authorization, including login and signup (AuthManager), session handling (SessionManager), BotPasswords, and password storage. Template:MaintainerLinksComponent	MediaWiki Engineering (MediaWiki Platform Team)	Template:U
BagOStuff	The wikimedia/bagostuff library (BagOStuff, WANObjectCache, Redis/Memcached clients) and their MediaWiki integrations. Template:MaintainerLinksComponent	MediaWiki Engineering (MediaWiki Platform Team)
Benchmarker	Facility for benchmarking backend latency and resource usage. Template:MaintainerLinksComponent	MediaWiki Engineering (MediaWiki Platform Team)
Blocks	Creating and managing user blocks, including Special:Block, Special:BlockList, and their APIs, hooks, and database tables. This was separated out from "User management" in 2020. Template:MaintainerLinksComponent	Trust and Safety Product
Comment store	Storing comments such as edit summaries, and log action reasons. Including access layers, value interfaces, and their database schema. Template:MaintainerLinksComponent	Unassigned	formerly Core Platform Team
Categories	All issues relating to categories. Template:MaintainerLinksComponent	Unassigned	Template:U
Change tagging	The feature that allows putting tags on revisions, log entries etc. added from edit filters in Extensions (AbuseFilter, TorBlock, etc). Template:MaintainerLinksComponent	Unassigned
Configuration	The Config and ExtensionRegistry components, for registering and loading site configuration and extensions. Template:MaintainerLinksComponent	Unassigned	Template:U, formerly Core Platform Team
ContentHandler	Representation of content values and their formatting. For the storing of content, see Revision-backend instead. Template:MaintainerLinksComponent	Unassigned	Template:U, formerly Core Platform Team
Core testing	Configuration and base classes for checkers, unit testing, and integration testing (PHPUnit, QUnit, etc). Template:MaintainerLinksComponent	Unassigned	Template:U, Template:U	Template:U
Debug Logger	Debug logging functions, debug toolbar, and PSR-3/Monolog integration. Template:MaintainerLinksComponent	Unassigned
DjVu	All issues related to DjVu Template:MaintainerLinksComponent	Structured Data team (details and SLA)
DeferredUpdates	The DeferredUpdates mechanism allows code to be scheduled after the HTTP web response has been sent to the browser. Template:MaintainerLinksComponent	Unassigned	formerly Performance Team
Documentation	Meta issues about MediaWiki core documentation both Doxygen/JSDuck-generated and on mediawiki.org Template:MaintainerLinksComponent	Unassigned	Template:U, Template:U
Email	Issues relating to the email notification features and email address verification (e.g. Special:EmailUser, and Special:ConfirmEmail) Template:MaintainerLinksComponent	Unassigned	Template:U
File management	Management of uploaded files (images, thumbnails, etc.) Template:MaintainerLinksComponent	Unassigned
Gallery	Gallery of media files as created by wikitext <gallery> tag. Template:MaintainerLinksComponent	Unassigned
Hooks	Hook system Template:MaintainerLinksComponent	MediaWiki Engineering (MediaWiki Interfaces Team)	Template:U, formerly Core Platform Team	Web (for changes to any hooks relating to skins)
HtmlFormatter	A library for HTML parsing and manipulationTemplate:MaintainerLinksComponent	Unassigned		Web (for any changes that might impact mobile)
HTMLForm	HTMLForm Template:MaintainerLinksComponent	Unassigned
HTML Templating	Mustache HTML templating (server-side in PHP, and client-side via mw.template) Template:MaintainerLinksComponent	Unassigned		Web (when making any significant library updates)
HTTP Cache	CDN purging and FileCache storage. Template:MaintainerLinksComponent	Unassigned	Template:U, Template:U, formerly Performance Team
Installer	Installation, setup, and upgrade procedure. Template:MaintainerLinksComponent	Unassigned		Jon Robson (happy to provide assistance in understanding the installer or code review if needed), James Forrester, Reedy
Internationalization	All issues relating to internationalization, localization, translation, and the MediaWiki namespace. Template:MaintainerLinksComponent	Language and Product Localization	Template:U, Template:U
Interwiki	Interwiki database and cache Template:MaintainerLinksComponent	Unassigned
JobQueue	Job queue Template:MaintainerLinksComponent	MediaWiki Engineering (MediaWiki Interfaces Team)	Template:U
Language converter	Script & regional term conversion for several languages, e.g. Chinese and Serbian. (Problem area -- not much developer capacity here.) Template:MaintainerLinksComponent	MediaWiki Engineering (Content Transform Team)	Template:U, Template:U, Template:U, Template:U (Chinese language)
Logging	Special:Log, mw_logging table Template:MaintainerLinksComponent	Unassigned	Template:U
Maintenance system	The Maintenance script system in MediaWiki core. Template:MaintainerLinksComponent	Unassigned	Template:U
Media handlers	Interface for extracting metadata and transforming media files, and the implementations thereof that ship with MediaWiki core. The built-in media handlers include for example extracting camera metadata from JPEG, and generating thumbnails from JPEG, PNG, SVG and other files. The interface is consumed by the Parser and Imageinfo API. The transformation methods of media handlers together make up the default image scaler and thumbnail service in core, and form the basis for PdfHandler, TimedMediaHandler, and DjVu extensions. Note that at WMF, the thumbnail service for still images is disabled in favour of Thumbor.Template:MaintainerLinksComponent	Unassigned
Merge history	The MergeHistory logic and its API and Special page frontend. Template:MaintainerLinksComponent	MediaWiki Engineering (MediaWiki Interfaces Team)
Mime	The wikimedia/mime library parses MIME types of uploaded files and maps file extensions for static resources via the MimeAnalyzer service. Template:MaintainerLinksComponent	Unassigned	formerly Performance Team
Output Transform	Post processing ParserOutput contents Template:MaintainerLinksComponent	MediaWiki Engineering (Content Transform Team)			Web (for changes to any visual changes)
Page deletion	Issues related to deleting and undeleting/restoring pages and revisions (via action=delete and Special:Undelete). Template:MaintainerLinksComponent	MediaWiki Engineering (MediaWiki Interfaces Team)	Template:U
Page derived data	Management of data derived from a page, including PageUpdater, LinksUpdate, RefreshLinks, and the database for storing this derived data (such as page_props, and link tables). Template:MaintainerLinksComponent	Unassigned	Template:U, formerly Core Platform Team		MediaWiki Engineering (Content Transform Team)
Page-Diffs	All issues relating to the page displaying differences between two revisions (diff=, oldid=, type=revision in the URL).Template:MaintainerLinksComponent	Unassigned			Web (for changes to any visual changes)
Page editing	All issues relating to the edit screen, edit conflicts, and saving edits. Template:MaintainerLinksComponent	Editing team
Page-History	All issues relating to the page displaying the history of revisions via the action=history view or Special:History page..Template:MaintainerLinksComponent	Unassigned			Web (for changes to any visual changes)
Page protection	Protection and unprotection of pages, and issues with protected pages Template:MaintainerLinksComponent	Unassigned	formerly Core Platform Team
Parser	Issues relating to the wikitext parser, which converts wikitext markup into HTML. Including ParserOutput and ParserCache. Template:MaintainerLinksComponent	MediaWiki Engineering (Content Transform Team)		Web (if changing anything that might impact how the page is rendered)
Parsoid integration	Issues relating to MediaWiki's integration with the next-generation Parsoid parser. Template:MaintainerLinksComponent	MediaWiki Engineering (Content Transform Team)
Patrolling	New page patrolling, edit patrolling. "[mark as patrolled]". rc_patrolled etc. Template:MaintainerLinksComponent	Unassigned	Template:U
Profiler	Issues relating to MediaWiki's built-in Profiler. Template:MaintainerLinksComponent	MediaWiki Engineering (MediaWiki Platform Team)
Recent changes	Bug reports and feature requests related to the special page RecentChanges. Template:MaintainerLinksComponent	Moderator Tools
Redirects	All issues relating to redirects. Template:MaintainerLinksComponent	Unassigned	Template:U
Revision backend	Issues related to the backend classes around revisions, blobs, and slots. Including Multi-Content-Revisions (MCR). Template:MaintainerLinksComponent	Unassigned	formerly Core Platform Team
ResourceLoader	ResourceLoader delivery and management system for loading modules in MediaWiki. Template:MaintainerLinksComponent	MediaWiki Engineering (MediaWiki Platform Team)		Template:U, Web (please consult on anything that might impact page load/defaults)	Web (for changes to any performance-impacting changes)
MW REST API	MediaWiki's web-based RESTful API framework that lets people interact with MediaWiki programmatically. Template:MaintainerLinksComponent	MediaWiki Engineering (MediaWiki Interfaces Team)
Revision deletion	Hiding and unhiding of individual page revisions, log entries and usernames and revision suppression. Template:MaintainerLinksComponent	MediaWiki Engineering (MediaWiki Interfaces Team)	Aaron Schulz
Rdbms	The wikimedia/rdbms library for interacting with relational databases, and its MediaWiki integration. Template:MaintainerLinksComponent	MediaWiki Engineering (MediaWiki Interfaces Team)	Ladsgroup (SRE Data Persistence)
Router	JavaScript module for parsing and matching in-page navigation routes (i.e. hash fragments). Template:MaintainerLinksComponent	Unassigned	originally: Jon Robson
Search	Issues relating to the search engine. Note that Wikimedia web sites do not use the default MediaWiki search engine; please file bugs against their Search under "CirrusSearch" instead! Template:MaintainerLinksComponent	Search Platform
Sites	Information about other sites Template:MaintainerLinksComponent	Unassigned
Shell	Shell framework for calling external binaries. Template:MaintainerLinksComponent	Unassigned
Skin system	Issues relating to the skin system, including Skin base classes, ResourceLoader integration, and the provided skinning stylesheets. Template:MaintainerLinksComponent	Web	mediawiki‑skins group, Template:U
Snapshots	Issues relating to XML snapshot generation and loading (maintenance scripts, API, interface at Special:Export/Special:Import) Template:MaintainerLinksComponent	Unassigned
Special pages	Issues relating to the SpecialPage framework, and the configuration and wiring relating to special pages in general. With the exception of built-in maintenance reports, issues about specific special pages should be reported under their own dedicated components instead (e.g. Page deletion, Recent changes, Search, Preferences, Watchlist, etc.). Template:MaintainerLinksComponent	Unassigned
Stats	Stats service for Statsd/Prometheus. Template:MaintainerLinksComponent	MediaWiki Engineering (MediaWiki Platform Team)	SRE/Observability (Template:U)
Templates	All issues relating to templates and template inclusion. Template:MaintainerLinksComponent	Unassigned	Template:U
Uploading	File upload interface at Special:Upload. (Issues with already uploaded files should be filed under "File management") Template:MaintainerLinksComponent	Unassigned
UUID	The Wikimedia\UUID library and the GlobalIdGenerator service wiring that uses it. Template:MaintainerLinksComponent	Unassigned	Template:U, Template:U, formerly Performance Team
User login and signup	Account creation, login, etc. Settings bugs in this component should be moved to the "User preferences" component. Template:MaintainerLinksComponent	Unassigned (Growth?) previously: Wikimedia Product Infrastructure team, Core Platform Team.	Template:U		Web
User management	Permissions and authorization Template:MaintainerLinksComponent	Unassigned	Template:U
User preferences	The preferences system (sometimes known as user options or user properties), including the PreferencesFactory and UserOptionsManager services, their interface (Special/API), and database table. Template:MaintainerLinksComponent	Unassigned	Moderator Tools
User rename	Provides a special page that allows user accounts to be renamed Template:MaintainerLinksComponent	Unassigned	Template:U
Watchlist	Bug reports and feature requests related to the special page Watchlist. Template:MaintainerLinksComponent	Growth team (Needs New Owner)	Watchlist Expiry: Community Tech		Web (for changes to any performance-impacting changes)

MediaWiki extensions deployed at Wikimedia Foundation

See also: Category:Extensions used on Wikimedia and phab:source/mediawiki-config/browse/master/wmf-config/extension-list

Extension	Description	Steward	Individual maintainer	Consultants
Template:Ll	Enables upload of three-dimensional model files, and supports thumbnailing and interactive viewing in Media Viewer. Template:MaintainerLinksExtension	Structured Data team (details and SLA)
Template:Ll	Allows privileged users to set specific controls on actions by users, such as edits, and create automated reactions for certain behaviors Template:MaintainerLinksExtension	(Active volunteer)	Template:U, Template:U, Template:U, Template:U
Template:Ll	Used as part of dumpBackup Template:MaintainerLinksExtension	Unassigned
Template:Ll	Enhances Special:Search by providing an advanced parameters form Template:MaintainerLinksExtension	WMDE Engineering (contact EMs)
Template:Ll	Prevents creation of confusable usernames Template:MaintainerLinksExtension	Trust and Safety Product	Template:U
Template:Ll	Access API feature usage log summaries Template:MaintainerLinksExtension	MediaWiki Engineering (MediaWiki Interfaces Team)
Template:Ll	Template:MaintainerLinksExtension	Community Tech
Template:Ll	Provides a special page with Wikidata information about a certain topic, with invitation to create an article for the topic Template:MaintainerLinksExtension	WMDE Engineering (contact EMs)
Template:Ll	Allows moderators to configure automated prevention or reversion of bad edits based on scoring from a machine learning model Template:MaintainerLinksExtension	Moderator Tools	Jason Sherman, Susana Cardenas Molinar
Template:Ll	Adds a parser function to inform other users about language proficiency and categorize users of the same levels and languages Template:MaintainerLinksExtension	Language and Product Localization
Template:Ll	Allows other extensions to register their beta features in the user preferences Template:MaintainerLinksExtension	Unassigned
Template:Ll	Allow MediaWiki to handle bounce email efficiently with VERP headers Template:MaintainerLinksExtension	Unassigned	Template:U, Template:U
Calendar	Creates a Calendar in pagesTemplate:MaintainerLinksExtension	Unassigned
Template:Ll	Adds tools for organizing events Template:MaintainerLinksExtension	Campaigns Product team
Template:Ll	Allows to track user account creations related to campaigns Template:MaintainerLinksExtension	Unassigned
Template:Ll	Provides basic Infobox functionality for ScribuntoTemplate:MaintainerLinksExtension	Unassigned	Template:U
Template:Ll	Provides a dynamic view of the wiki's category structure as a tree Template:MaintainerLinksExtension	Unassigned
Template:Ll	Allows to merge accounts into global accounts Template:MaintainerLinksExtension	MediaWiki Engineering (MediaWiki Platform Team)	Template:U
Template:Ll	Adds a central sitenotice Template:MaintainerLinksExtension	Fundraising tech [primarily for FR use cases]
Template:Ll	Create JavaScript character insert boxes Template:MaintainerLinksExtension	Editing team
Template:Anchor CheckUser	Allows a user with permissions to check which IPs are used by a given username and which usernames are used by a given IP Template:MaintainerLinksExtension	Trust and Safety Product	Template:U
Template:Ll	Implements searching for MediaWiki using Elasticsearch Template:MaintainerLinksExtension	Search Platform
Template:Ll	Allows footnotes for citing sources and helps for correctly citing content in offline media Template:MaintainerLinksExtension	Editing team	Template:U
Template:Ll	Adds a special page that provides different citation formats for a particular article Template:MaintainerLinksExtension	Unassigned	Template:U
Template:Ll	Extension part of the Citoid service Template:MaintainerLinksExtension	Editing team
Template:Ll	Import localisation data from CLDR Template:MaintainerLinksExtension	Language and Product Localization
Template:Ll	Provides a syntax-highlighting code editor for site & user JS, CSS and Lua pages, integrating with advanced edit toolbar Template:MaintainerLinksExtension	Editing team	Template:U
CodeMirror	Provides syntax highlighting in MediaWiki's wikitext editor.Template:MaintainerLinksExtension	Community Tech	Template:U
Template:Ll	Centralises Wiktionary links into WikidataTemplate:MaintainerLinksExtension	WMDE Engineering (contact EMs)
Template:Ll	Allows organization of personal selections of pages in a collection that can be edited, persisted and optionally retrieved as PDF, ODF or DocBook (XML) Template:MaintainerLinksExtension	Unassigned Under review	Template:U originally: PediaPress
Template:Ll	Extracts metadata from commons pages Template:MaintainerLinksExtension	Structured Data team (details and SLA)
Template:Ll	Allows editors with extended rights the ability to configure on-wiki functionality for all users. Template:MaintainerLinksExtension	Growth team
Template:Ll	Adds CAPTCHAs for page saves and other user actions. Only QuestyCaptcha is supported. Template:MaintainerLinksExtension	Editing team	Template:U, Template:U
Template:Ll	Provides a contact form for visitors Template:MaintainerLinksExtension	MediaWiki Engineering (Content Transform Team) - SLA details	Template:U
Template:Ll	Allows editors to translate an article from one language to another with the help of machine translation and other aids. Template:MaintainerLinksExtension	Language and Product Localization
Template:Ll	Display source work credits in the page footer Template:MaintainerLinksExtension	Unassigned
Template:Ll	Renders the JSON used to configure dashiki dashboards in a friendly HTML tableTemplate:MaintainerLinksExtension	Data Engineering
Template:Ll	Enables the designation of disambiguation pages with a magic word Template:MaintainerLinksExtension	Unassigned
Template:Ll	Tools to enhance discussion pages Template:MaintainerLinksExtension	Editing team
Template:Ll	Allows users to close the sitenotice Template:MaintainerLinksExtension	Unassigned
Template:Ll	Provides fundraising mechanisms for collecting payments Template:MaintainerLinksExtension	Fundraising tech
Template:Ll (aka Intersection)	Outputs a bulleted list of most recent items residing in a category, or an intersection of several categories Template:MaintainerLinksExtension	Unassigned	Brian Wolff
Template:Ll	Shows a dynamic sidebar based on user configuration Template:MaintainerLinksExtension	Unassigned	Derick Alangi
Template:Ll	Produces an embedded timeline image from special syntax inside Template:Tag tags.Template:MaintainerLinksExtension	Unassigned	Antoine Musso (knows about the code)
Template:Ll	MediaWiki's notification subsystem Template:MaintainerLinksExtension	Growth team (Needs New Owner)
Template:Ll	Provides base elasticsearch functionality Template:MaintainerLinksExtension	Search Platform
Template:Ll	Converts wiki pages to PDFs using Electron.Template:MaintainerLinksExtension	WMDE Engineering (contact EMs)
Template:Ll	Stores Shape Expressions Schemas on wiki pages (for Wikidata).Template:MaintainerLinksExtension	WMDE Engineering (contact EMs)
Template:Ll	Propagates change events to a RESTful service. Transports data between arbitrary applications, in the form of events that conform to versioned schemas. Template:MaintainerLinksExtension	Data Platform Engineering	—
Template:Ll	Provides logging and validation of web analytics events Template:MaintainerLinksExtension	Data Engineering
Template:Ll	Exposes event stream configs in an API endpoint. Can also be used to expose configs via ResourceLoader.Template:MaintainerLinksExtension	Data Engineering (Andrew Otto)
Template:Ll	Enables the distribution of extensions from www.mediawiki.org Template:MaintainerLinksExtension	Unassigned	Template:U
Template:Ll	Indicates to users that the wiki page being viewed is served through an external service, and provides ways to contribute back to the original wiki. Template:MaintainerLinksExtension	Language and Product Localization
Template:Ll	Adds syndication feeds of wiki's featured content Template:MaintainerLinksExtension	MediaWiki Engineering (Content Transform Team) - SLA details
Template:Ll	Provides a link to export local files to another wiki that has the FileImporter extension. Template:MaintainerLinksExtension	WMDE Engineering (contact EMs)
Template:Ll	Allows for the easy importing of a file from one wiki to another. Template:MaintainerLinksExtension	WMDE Engineering (contact EMs)
Template:Ll	Allows for article content management by "editor" and "reviewer" classes Template:MaintainerLinksExtension	Unassigned Under Review		Aaron Schulz, Amir Sarabadani
StructuredDiscussions (aka Flow)	A modern discussion and collaboration system Template:MaintainerLinksExtension	Growth team (Needs New Owner)
Template:Ll	Enables template parameters to be passed as querystring elements Template:MaintainerLinksExtension	Fundraising tech
Template:Ll	Locks down translation publishing rights on selected pages Template:MaintainerLinksExtension	Fundraising tech (Template:U)
Template:Ll	Donor-facing fundraising email unsubscribe form (on payments.wikimedia.org) Template:MaintainerLinksExtension	Fundraising tech
Template:Ll	Allows users to enable JS-based, user-provided gadgets from their preferences page Template:MaintainerLinksExtension	Unassigned	Template:U, Template:U, Timo Tijhof, Template:U
Template:Ll	Adds a trail of bread crumbs to the page Template:MaintainerLinksExtension	Unassigned
Template:Ll	Adds geographical coordinates storage and retrieval functionality Template:MaintainerLinksExtension	Search Platform Team
Template:Ll	Allows IP addresses to be blocked on multiple wikis Template:MaintainerLinksExtension	Trust and Safety Product
Template:Ll	Allows global CSS and JS on a "central" wiki to be loaded for all wikis in the farm Template:MaintainerLinksExtension	Unassigned
Template:Ll	Allows a user to decide which user preferences to set as global (wikifarm-wide) and which to keep local.Template:MaintainerLinksExtension	Community Tech
Template:Ll	Enables viewing of global image use in a wiki farm with shared image repository Template:MaintainerLinksExtension	Structured Data team (details and SLA)
Template:Ll	Enables global (shared between wikis) user pages on a wiki farm Template:MaintainerLinksExtension	Unassigned
Template:Ll	Allows a user to view changes to watched pages on multiple sites at once Template:MaintainerLinksExtension	(Active volunteer)	Template:U
Template:Ll	Outputs a list of pages based on what categories they are in as an RSS feed or Google news sitemap Template:MaintainerLinksExtension	Unassigned	Brian Wolff
Template:Ll	Data-driven graphs Template:MaintainerLinksExtension	Editing team
Template:Ll	Contains experiments done by the Growth team Template:MaintainerLinksExtension	Growth team
Template:Ll	Delivers guided tours Template:MaintainerLinksExtension	Growth team (Needs New Owner)
Template:Ll	Allows clickable HTML image maps Template:MaintainerLinksExtension	Editing team
Template:Ll	Image recommendation features for experienced users Template:MaintainerLinksExtension	Structured Data team (details and SLA)
Template:Ll	Allows users to add predefined HTML forms to wiki pages Template:MaintainerLinksExtension	Unassigned
Template:Ll	Lists volunteer tour guides for travel destinations Template:MaintainerLinksExtension	Unassigned
Template:Ll	Adds a special page to view and manipulate the interwiki table Template:MaintainerLinksExtension	Unassigned
Template:Ll	Allows sorting of interwiki links Template:MaintainerLinksExtension	WMDE Engineering (contact EMs)
Template:Ll	Displays IP information for anti-vandalism purposes Template:MaintainerLinksExtension	Trust and Safety Product
Template:Ll	Provides access for fetching, logging, and acting on IP reputation data Template:MaintainerLinksExtension	Trust and Safety Product
Template:Ll	Automates josa part of Korean postposition process Template:MaintainerLinksExtension	Unassigned
Template:Ll	Provides a wiki-based JSON configuration system Template:MaintainerLinksExtension	MediaWiki Engineering (Content Transform Team) - SLA details
Template:Ll	Allows adding maps to pages Template:MaintainerLinksExtension	MediaWiki Engineering (Content Transform Team)	Mateus Santos
Template:Ll	Enables marked sections of text to be transcluded Template:MaintainerLinksExtension	Unassigned
Template:Ll	Send users to localized landing pages with fallback options Template:MaintainerLinksExtension	Fundraising tech
Template:Ll	Help users find out-dated bits of wikitext to fix them Template:MaintainerLinksExtension	MediaWiki Engineering (Content Transform Team)
Template:Ll	A structured discussion system for MediaWiki Template:MaintainerLinksExtension	Unassigned
Template:Ll	Notify users of suspicious logins Template:MaintainerLinksExtension	Community Tech
Template:Ll	Gives access to several data and mapping sources Template:MaintainerLinksExtension	Unassigned
Template:Ll	Allows users to send messages across wikis Template:MaintainerLinksExtension	Unassigned
Template:Ll	Renders mathematical formulas between <math> ... </math> tags Template:MaintainerLinksExtension	Editing team	Template:U, Template:U
Template:Ll	Checks uploaded media for possible child exploitation content.	Trust and Safety Product	formerly Platform Engineering Team, Core Platform Team.
Template:Ll	An alternative, media-focused way to display search results through the Special:MediaSearch page. Template:MaintainerLinksExtension	Structured Data team (details and SLA)
Template:Ll	Provides Metrics Platform derived stream configs to EventStreamConfig via hook. Template:MaintainerLinksExtension	Data Products	Template:U, Template:U, Template:U
Template:Ll	Serves styles and scripts for use in the Wikimedia native apps Template:MaintainerLinksExtension	Apps, MediaWiki Engineering (Content Transform Team) - SLA details
Template:Ll	Optimizes content for mobile experiences.Template:MaintainerLinksExtension	Web (SLA details)
Template:Ll	Provides a better experience to users when they click on thumbnails in a page Template:MaintainerLinksExtension	Structured Data team (details and SLA)
Template:Ll	Logs perceived latency measurements from client-side Template:MaintainerLinksExtension	Unassigned	formerly Performance Team
Template:Ll	A SessionProvider for api requests based on configured ip address and a secret token Template:MaintainerLinksExtension	Search Platform	Erik Bernhardson
Template:Ll	Adds a preference for newsletter subscription Template:MaintainerLinksExtension	Unassigned	Brian Wolff (for emergency issues)
Template:Ll	Adds a message to newly created user's talk pages Template:MaintainerLinksExtension	Growth team (Needs New Owner)
Template:Ll	Gives sysops the ability to mass delete pages Template:MaintainerLinksExtension	Moderator Tools
Template:Ll	An HMAC based One Time Password extension, providing two-factor authentication Template:MaintainerLinksExtension	MediaWiki Engineering (MediaWiki Platform Team)	Template:U
Template:Ll	Allow users to safely authorize another application (Consumer) to use the MediaWiki api on their behalf Template:MaintainerLinksExtension	MediaWiki Engineering (MediaWiki Platform Team)	Template:U, Template:U
Template:Ll	Implements an OAuth hook to add rate limit values to the OAuth JSON Web Token (JWT)Template:MaintainerLinksExtension	MediaWiki Engineering (MediaWiki Platform Team)
Template:Ll	Integrates data from the ORES project into the RecentChanges view Template:MaintainerLinksExtension	Machine Learning Team/Scoring Platform team
Template:Ll	Stores assessments of pages made by WikiProjects Template:MaintainerLinksExtension	Community Tech
Template:Ll	Handles TIFF files, including multi-paged images Template:MaintainerLinksExtension	MediaWiki Engineering (Content Transform Team) - SLA details
Template:Ll	Stores information about images representing a page Template:MaintainerLinksExtension	Web (SLA details) Pending stewardship review
Template:Ll	Displays notices at the top of all pages in a namespaceTemplate:MaintainerLinksExtension	Active volunteer	TTO
Template:AnchorPageTriage	Facilitates reviewing and approving new pages Template:MaintainerLinksExtension	Moderator Tools	Template:U	Template:U
Template:Ll	Provides fancy looking graphs of Wikimedia page view data Template:MaintainerLinksExtension	Unassigned
Template:Ll	Enhances parser with logical and string functions Template:MaintainerLinksExtension	MediaWiki Engineering (Content Transform Team)	Template:U, Template:U?
Template:Ll	Allows users to preview the appearance of articles with the new Parsoid parser Template:MaintainerLinksExtension	MediaWiki Engineering (Content Transform Team)
Template:Ll	Handles PDF files like multipage DJVU Template:MaintainerLinksExtension	MediaWiki Engineering (Content Transform Team) - SLA details	Template:U
Template:Ll	Text to speech parser and inline audio player Template:MaintainerLinksExtension	Language and Product Localization		Community Tech
Template:Ll	Adds <poem> tag for poem formatting Template:MaintainerLinksExtension	Unassigned
Template:Ll	Displays popups when users hover over article links (aka. Hovercards) Template:MaintainerLinksExtension	Web (SLA details)
Template:Ll	Helps proofreading of books. Template:MaintainerLinksExtension	(Active volunteer)	Template:U, Template:U (mostly on the Javascript/interface side of things)
Template:Ll	Provides suggested properties when a user tries to add new statements to a Wikidata item. Template:MaintainerLinksExtension	WMDE Engineering (contact EMs)
Template:Ll	Provides in-article quick surveys or external survey to poll readers for opinions. Template:MaintainerLinksExtension	Web (SLA details)	Consult Web for large architectural changes or UBN bugs. Others are feel free to contribute and merge changes to this extension.
Template:Ll	Quiz building tool adopted on the Wikiversity Template:MaintainerLinksExtension	Unassigned
Template:Ll	Provides an API for storing and retrieving private lists of pages. Template:MaintainerLinksExtension	MediaWiki Engineering (Content Transform Team) - SLA details
Template:Ll	Parser function to associate related articles (cf. Wikivoyage) Template:MaintainerLinksExtension	Web (SLA details)
Template:Ll	Allows verifying URLs used on user pages Template:MaintainerLinksExtension	(Active volunteer)	Template:U
Template:Ll	Allow users to report incidents of harassment and abuse. Template:MaintainerLinksExtension	Trust and Safety Product
Template:Ll	Visualizes revision history Template:MaintainerLinksExtension	WMDE Engineering (contact EMs)
Template:Ll	Displays RSS feeds on a wiki page Template:MaintainerLinksExtension	Unassigned
Template:Ll	Provides a link in personal tools to a per-user sandbox Template:MaintainerLinksExtension	Unassigned	Matma Rex (Bartosz Dziewoński)
Template:Ll	Automatically rewrites URLs to HTTPS if domain always requires HTTPS (T200745) Template:MaintainerLinksExtension	Unassigned	Template:U, formerly Core Platform Team
Template:Ll	Allows rendering of musical scores with en:LilyPond Template:MaintainerLinksExtension	Editing team	Template:U, Template:U
Template:Ll	Provides a framework for embedding scripting languages into MediaWiki pages Template:MaintainerLinksExtension	Unassigned	Template:U, Template:U, Template:U, Template:U, formerly Core Platform Team; possibly Content Transform Team
Template:Ll	Searches extra specified namespaces if no direct match is found Template:MaintainerLinksExtension	Unassigned
Template:Ll	Vue.js augmentations and improvements to Special:Search Template:MaintainerLinksExtension	Structured_Data_Across_Wikimedia
Template:Ll	Extension for elections and surveys Template:MaintainerLinksExtension	Trust and Safety Product	Template:U, Template:U
Template:Ll	Adds a special page that redirects to an article based on the given base36-encoded ID Template:MaintainerLinksExtension	Unassigned Under review
Template:Ll	Adds a special page for discovering editors with similar edit histories Template:MaintainerLinksExtension	Trust and Safety Product
Template:Ll	A special page with a matrix of all Wikimedia sites Template:MaintainerLinksExtension	Unassigned
Template:Ll	Provides a regex-based spam filter Template:MaintainerLinksExtension	Unassigned (under review)
Template:Ll	Blocks write actions based upon stopforumspam.com deny lists Template:MaintainerLinksExtension	Wikimedia Security Team (Template:U, Template:U)	Template:U
Template:Ll	Provides a splist tag to list the subpages of a page Template:MaintainerLinksExtension	Unassigned
Template:Ll	Changes the default sortkey to have something to do with the subpages Template:MaintainerLinksExtension	Unassigned	Template:U
Template:Ll	Provide a wikitext feature to embed source code examples on wiki pages with syntax highlighting. Powered by Pygments via Shellbox, and includes a VisualEditor plugin. Template:MaintainerLinksExtension	Editing team	Template:U
Template:Ll	Creates and extracts data about templates and their usage Template:MaintainerLinksExtension	Editing team
Template:Ll	Enables page previews using sandboxed templates Template:MaintainerLinksExtension	Unassigned	Template:U
Template:Ll	Allows for loading sanitized CSS stylesheets from a template Template:MaintainerLinksExtension	MediaWiki Engineering (Content Transform Team)	Template:U
Template:Ll	Adds a popup dialog box for adding template code to wikitext. Template:MaintainerLinksExtension	Community Tech	Template:U
Template:Ll	Provides API with plain-text or limited HTML extracts of page content Template:MaintainerLinksExtension	Web (SLA details) Pending stewardship review.
Template:Ll	Lets users thank other users for individual edits Template:MaintainerLinksExtension	Growth team (Needs New Owner)
Template:Ll	Notifies users of their eligibility for the Wikipedia Library when they cross the edit count and account age thresholds Template:MaintainerLinksExtension	Moderator Tools	Jason Sherman, Susana Cardenas Molinar
Template:Ll	Provides integrated support for server side transcoding, WebM, Ogg Theora, Vorbis, Speex and Timed Text Template:MaintainerLinksExtension	Unassigned	Template:U (Emergency Backup: Structured Data), Template:U
Template:Ll	Blocks the creation of pages matching a regular expression blacklist Template:MaintainerLinksExtension	Unassigned	Template:U
Template:Ll	Adds options for floated or expanded table of contents (cf. Wikivoyage) Template:MaintainerLinksExtension	Unassigned
Template:Ll	Automatically applies restrictions to Tor exit nodes with access to the wiki's front-door server Template:MaintainerLinksExtension	Unassigned	formerly Core Platform Team.
Template:Ll	Enables in-wiki translation and proofreading Template:MaintainerLinksExtension	Language and Product Localization
Template:Ll	Allows translators sign up for translation notifications Template:MaintainerLinksExtension	Language and Product Localization
Template:Ll	Handles trusted proxy addresses (XFF) Template:MaintainerLinksExtension	Unassigned	formerly Core Platform Team.
Template:Ll	Provides an interactive two-column edit conflict resolution tool Template:MaintainerLinksExtension	WMDE Engineering (contact EMs)
Template:Ll	Allows users to select a language and configure its support in an easy way. Template:MaintainerLinksExtension	Language and Product Localization
Template:Ll	Provides a link in personal tools to a user's uploads Template:MaintainerLinksExtension	Unassigned		Template:U
Template:Ll	Helps people upload media to Commons. Template:MaintainerLinksExtension	Structured Data team (details and SLA), Template:U
Template:Ll	Provides a basic URL shortening serviceTemplate:MaintainerLinksExtension	Unassigned	formerly Core Platform Team.
VipsScaler	Create JPEG and PNG thumbnails at higher speed and low memory use via libvips. This replaces the default Media handlers for bitmaps, which use ImageMagick. Template:MaintainerLinksExtension	MediaWiki Engineering (Content Transform Team)	Tim Starling, formerly Wikimedia Platform Engineering (2013)
Template:Ll	Enables a rich-text editor for wiki pages (see also Parsoid) Template:MaintainerLinksExtension	Editing team
Template:Ll	A module for OATHAuth extension that provides authentication using WebAuthn API	MediaWiki Engineering (MediaWiki Platform Team)	Template:U
Template:Ll	Client for structured data repository Template:MaintainerLinksExtension	WMDE Engineering (contact EMs)
Template:Ll	Structured data repository Template:MaintainerLinksExtension	WMDE Engineering (contact EMs)
Template:Ll	Implements searching for Wikibase repositories using Elasticsearch Template:MaintainerLinksExtension	Search Platform
Template:Ll	Structured lexicographical data Template:MaintainerLinksExtension	WMDE Engineering (contact EMs)
Template:Ll	Implements searching for Wikibase Lexemes using Elasticsearch Template:MaintainerLinksExtension	Search Platform
Template:Ll	Wikibase extension to manage structured metadata of media files Template:MaintainerLinksExtension	Structured Data team (details and SLA)
Template:Ll	Wikibase extension to check editor-defined constraints on entity data Template:MaintainerLinksExtension	WMDE Engineering (contact EMs)
Wikidata.org	Specific code for Wikibase as running on Wikidata.org	WMDE Engineering (contact EMs)
Template:Ll	Adds pagewide banners at the top of pages in specified namespaces on a wiki. Template:MaintainerLinksExtension	Web (SLA details)
Template:Ll	Provides an extendable wikitext editing interface and many feature-providing modules Template:MaintainerLinksExtension	Editing team	Template:U
Template:Ll	Enables the use of hieroglyphs with additional syntaxes Template:MaintainerLinksExtension	Unassigned	Template:U	Jdlrobson
Template:Ll	Enables a wiki to host functions written, managed, and evaluated by users Template:MaintainerLinksExtension	Abstract Wikipedia team
Template:Ll	Makes it easy to add positive feedback to user talk pages Template:MaintainerLinksExtension	Unassigned		Jdlrobson
Template:Ll	The WikimediaApiPortalOAuth extension is designed to connect the API Portal with the OAuth server on Meta-Wiki. It provides a user interface to create and manage OAuth 2.0 clients.	Unassigned	formerly Core Platform Team.
Template:Ll	Default themes to display badges on Wikimedia projects Template:MaintainerLinksExtension	WMDE Engineering (contact EMs)
Template:Ll	Wikimedia-specific add-ons for the CampaignEvents extension Template:MaintainerLinksExtension	Campaigns Product team
Template:Ll	Task generation, storage, and API service for microcontribution suggestions Template:MaintainerLinksExtension	MediaWiki Engineering (Content Transform Team)
Template:Ll	Event instrumentations and wiring for Wikimedia Foundation sites Template:MaintainerLinksExtension	Data Products	See OWNERs.md file for individual owners of each schema.
Template:Ll	Adds functions meant for Wikimedia Incubator Template:MaintainerLinksExtension	(Active volunteer)	Template:U (and currently inactive: Template:U, Template:U, Template:U)
Template:Ll	Various WMF-specific maintenance scripts Template:MaintainerLinksExtension	Unassigned	Sam Reed
Template:Ll	Adds Wikimedia specific messages and grammar, as well as Wikimedia specific overrides for license related messages Template:MaintainerLinksExtension	Unassigned	Template:U
Template:Ll	Template:MaintainerLinksExtension	Community Tech	Tpt	Template:U
Template:Ll	Template:MaintainerLinksExtension	Language and Product Localization (SBisson)
Template:Ll	Communicates analytic information for WMF to logging infrastructure Template:MaintainerLinksExtension	Unassigned

MediaWiki skins deployed at Wikimedia Foundation

See also: Category:Skins used on Wikimedia and phab:source/mediawiki-config/browse/master/wmf-config/extension-list

Skin	Phabricator tag	Description	Steward	Individual maintainer	Consultants
Vector	#Vector	MediaWiki's default skin since 2010; outcome of the Usability Initiative. The Web team does not triage any tasks for Vector tagged with one of: #Responsive-Vector, #Reading-Web-Local-Wiki-Issues, #MediaWiki-Core-Testing.	Web (SLA details)
MinervaNeue	#MinervaNeue	A mobile-first skin for Wikipedia.	Web (SLA details)
Timeless	#Timeless	A fully featured skin that emphasises both content and editing tools.	Unassigned	Isarra	Jon Robson
MonoBook	#MonoBook	An old skin from 2004, in grey.	Web (SLA details)	Bartosz Dziewoński
CologneBlue	#CologneBlue	An old skin from 2002, in blue.	Web (SLA details)	Bartosz Dziewoński
Modern	#Modern	An old, unsupported skin from 2008.	Web (SLA details)
Nostalgia	#Nostalgia	An old, unsupported skin that pretends to be UseMod. Only available on https://nostalgia.wikipedia.org	Web (SLA details)
WikimediaApiPortal	#WikimediaApiPortal	WikimediaApiPortal is a skin for MediaWiki created by the Wikimedia Foundation Core Platform Team in 2020 as part of the API Gateway initiative. The skin is designed to mimic the look and feel of conventional developer portals by incorporating header and sidebar navigation elements and following the Wikimedia Design Style Guide. The skin uses the Bootstrap CSS framework, OOUI library, and Mustache templates. The skin was created for use with the Wikimedia API Portal, so some elements of the design such as the site logo and footer are specific to Wikimedia.	Unassigned	formerly Core Platform Team

Libraries deployed with MediaWiki at Wikimedia Foundation

For upstream libraries that we bundle, see Upstream projects. For other libraries that we publish see doc.wikimedia.org (includes developer dependencies, and projects not used by MediaWiki).

MediaWiki core libraries

See also the composer.json and foreign-resources.yaml files in MediaWiki core.

Frontend and backend libraries that are published by Wikimedia and bundled with MediaWiki core.

Library	Repository	Issue tracker	Steward	Individual maintainer	Language(s)
cssjanus/cssjanus	Gerrit	Phabricator	MediaWiki Engineering (MediaWiki Platform Team)		PHP
oojs	Gerrit	Phabricator	MediaWiki Engineering (MediaWiki Platform Team)		JS
oojs-ui	Gerrit	Phabricator	Design System Team (Roan Kattouw, Anne Tomasevich, Eric Gardner, Volker E., Lauralyn Watson)	originally: James Forrester, Bartosz Dziewoński, Volker E., Ed Sanders	JS, PHP
jquery-client	Gerrit	Phabricator	MediaWiki Engineering (MediaWiki Platform Team)		JS
wikimedia/assert	Gerrit	TBD	Unassigned		PHP
wikimedia/at-ease	Gerrit	Phabricator	Unassigned	formerly Performance Team	PHP
wikimedia/base-convert	Gerrit	Phabricator	Unassigned		PHP
wikimedia/cdb	Gerrit	Phabricator	Unassigned	formerly Performance Team	PHP
wikimedia/codex	Gerrit	Phabricator	Design System Team (Roan Kattouw, Anne Tomasevich, Eric Gardner, Volker E., Lauralyn Watson)		JS, Vue, Less
wikimedia/common-passwords	Gerrit	Phabricator	Unassigned	originally: Sam Reed	PHP
wikimeda/composer-merge-plugin	GitHub	GitHub	Unassigned	originally: Bryan Davis	PHP
wikimedia/CLDRPluralRuleParser	Gerrit	Phabricator	Language and Product Localization (Niklas Laxström)		PHP
wikimedia/html-formatter	Gerrit	Phabricator	Unassigned		PHP
wikimedia/ip-utils	Gerrit	Phabricator	Unassigned	Brandon Black	PHP
wikimedia/less.php	Gerrit	Phabricator	MediaWiki Engineering (MediaWiki Platform Team)		PHP
wikimedia/minify	Gerrit	Phabricator	MediaWiki Engineering (MediaWiki Platform Team)		PHP
wikimedia/normalized-exception	Gerrit	Phabricator	Unassigned	Gergő Tisza	PHP
wikimedia/object-factory	Gerrit	Phabricator	Unassigned	originally: Bryan Davis	PHP
wikimedia/parsoid	Gerrit	Phabricator	Content Transform Team (Subbu Sastry, C. Scott Ananian)		PHP
wikimedia/php-session-serializer	Gerrit	Phabricator	MediaWiki Engineering (MediaWiki Platform Team)		PHP
wikimedia/purtle	Gerrit	Phabricator	WMDE	Stas Malyshev	PHP
wikimedia/relpath	Gerrit	Phabricator	MediaWiki Engineering (MediaWiki Platform Team)		PHP
wikimedia/remex-html	Gerrit	Phabricator	Unassigned	originally: Core Platform Team	PHP
wikimedia/request-timeout	Gerrit	Phabricator	Unassigned	formerly Performance Team	PHP
wikimedia/running-stat	Gerrit	Phabricator	Unassigned	formerly Performance Team	PHP
wikimedia/scoped-callback	Gerrit	Phabricator	Unassigned	formerly Performance Team	PHP
wikimedia/services	Gerrit	Phabricator	Unassigned	Legoktm, formerly Core Platform Team	PHP
wikimedia/shellbox	Gerrit	Phabricator	Unassigned	Tim Starling, Legoktm	PHP
wikimedia/utfnormal	Gerrit	Phabricator	Unassigned	originally: Brooke Vibber	PHP
wikimedia/timestamp	Gerrit	Phabricator	Unassigned	formerly Performance Team	PHP
wikimedia/wait-condition-loop	Gerrit	Phabricator	Unassigned	formerly Performance Team	PHP
wikimedia/wrappedstring	Gerrit	Phabricator	MediaWiki Engineering (MediaWiki Platform Team)		PHP
wikimedia/xmp-reader	Gerrit	Phabricator	Unassigned		PHP

MediaWiki extension libraries deployed at Wikimedia

Library	Repository	Issue tracker	Steward	Individual maintainer	Language(s)
VisualEditor	Gerrit	Phabricator	Editing team (Ed Sanders)		JS
UnicodeJS	Gerrit	Phabricator	Editing team (David Chan, Ed Sanders)		JS
jquery.uls	GitHub	GitHub	Language and Product Localization (Santhosh Thottingal)		JS
jQuery.IME	GitHub	GitHub	Language and Product Localization (Santhosh Thottingal)		JS
jQuery.i18n	GitHub	GitHub	Language and Product Localization (Santhosh Thottingal)		JS
jQuery WebFonts	GitHub	GitHub	Language and Product Localization (Santhosh Thottingal)		JS
wikimedia/css-sanitizer	Gerrit	Phabricator	Unassigned	originally: Gergő Tisza	PHP
wikimedia/equivset	Gerrit	Phabricator	Unassigned	originally: Brooke Vibber	PHP
wikimedia/lucene-explain-parser	Gerrit	Phabricator	Search Platform		PHP
wikimedia/textcat	Gerrit	Phabricator	Search Platform (Trey Jones)		PHP
wikimedia/zest-css	Gerrit	Phabricator	Content Transform Team (C. Scott Ananian)		PHP
wikimedia/metrics-platform	GitLab	Phabricator	Data Products		JS, PHP

Upstream projects and libraries

Template:TNT There are many upstream projects on which MediaWiki, extensions, and/or Wikimedia depend. Some of them were "invented here", as stand-along libraries, or split out as part of the Library infrastructure for MediaWiki project. Some of them are widely-used third party tools to which community members provide improvements or support. Others are merely used with gratitude.

Services and administration

See also: wikitech:Category:Services and m:FLOSS-Exchange

Template:Note If you need immediate help with a systems administration question, please go into the IRC channel Template:Irc and find the person currently on Ops Clinic duty" (as listed in the /topic).

Service	Description	Steward	Individual maintainer	Consultants
API Gateway	The API Gateway is a service that runs in Kubernetes based on Envoy. The service implements many features central to serving the unified API and the API portal.	Unassigned	formerly Core Platform Team
Add A Link	The Link Recommendation Service recommends phrases of text in an article to link to other articles on a wiki. Users can then accept or reject these recommendations. The services consists of the research/mwaddlink python application and the linkrecommendation service deployed in Kubernetes	Add a Link teams
AS Report	Generation of public asoranking monthly dataset and accompanying webpage.	Unassigned	formerly Performance Team, Timo Tijhof
Arc Lamp	Collect sample profiles from production traffic using Excimer and aggregate into flame graphs.	SRE Observability	formerly Performance Team
navtiming	Webperf processor service between Navigation Timing extension and Grafana.	Unassigned	formerly Performance Team, SRE Observability
Backup & data recovery management	Backups and recoveries are normally self-served & automated (setting up new backups, generating them, recovering from, but Data Persistence "owns" the setup and maintenance of the infrastructure, and can support people needing help for the centralized setup (using Bacula, MinIO and Python), specially for new, large projects with special needs.	SRE > Data Persistence (Jaime Crespo)
CDN (HAProxy, Varnish, ATS)	Infrastructure for CDN caching and global traffic routing between data centers. See also SLO/HAProxy, SLO/Varnish, and SLO/Trafficserver.	SRE > Traffic
ChangeProp	Change propagation	Unassigned	formerly Core Platform Team
Citoid	Citoid	Unassigned	formerly Core Platform Team
Cloud Services	Wikimedia Cloud Services computing infrastructure, the Toolforge hosting environment, and many additional supporting technologies used in the Cloud Services environment. https://wikitech.wikimedia.org/wiki/Help:Cloud_Services_introduction	Wikimedia Cloud Services team
Continuous integration	The WMF CI infrastructure, including Jenkins, Zuul and the https://integration.wikimedia.org/ portal.	Release Engineering (as of 2016-09-21)	integration group
cxserver	cxserver	Language and Product Localization
DNS	Issues relating to the nameserver configuration.	SRE > Traffic
Databases (MariaDB)	Administration and troubleshooting of Database servers.	SRE > specially (but not only) DBAs. wikitech:MariaDB
Elasticsearch	Search engine as used by MediaWiki in production, via the CirrusSearch extension. See also SLO/Search.	Search Platform
Etherpad	Anything related to Wikimedia's installation of Etherpad or Etherpad Lite. https://wikitech.wikimedia.org/wiki/etherpad.wikimedia.org https://etherpad.wikimedia.org	SRE > Collaboration Services	Template:U, Alexandros Kosiaris, Daniel Zahn
Etcd (Main cluster)	State management for WMF tier 1 production services, including for Varnish and MediaWiki. See also SLO/etcd main cluster.	SRE > Service Operations
Extension setup	New extensions to get installed or enabled. Just like 'Site configuration' but more specific. See: Category:Extensions used on Wikimedia	Release Engineering (as of 2016-09-21)		Sam Reed
Fresh	Fast and ready-to-use Docker container with developer tools for Node.js and headless browsers.	Release Engineering
Fundraising Misc.	A catch-all for miscellaneous fundraising-related components not covered by MediaWiki extensions and civicrm. See: https://wikitech.wikimedia.org/wiki/Fundraising	FR Tech
Graphite	https://graphite.wikimedia.org/ - a real-time performance graphing system	SRE
Gerrit	Issues with Wikimedia's Gerrit installation for code review and Git repository historing, at gerrit.wikimedia.org	Release Engineering (as of 2016-09-21)
GitLab		Release Engineering, SRE > Collaboration Services
IDM	The account creation and login portal for Wikimedia Developer accounts (sometimes known as "LDAP" or "Gerrit" accounts) located at idm.wikimedia.org (codenamed "Bitu").	SRE > Infrastructure Foundations
Image-suggestion service	HTTP API exposing data from the Image Suggestions pipeline to the ImageSuggestions MediaWiki extension.	Structured Data team	formerly Core Platform Team
irc.wikimedia.org	Issues with Recent Changes feeds on irc.wikimedia.org. For help with Libera Chat IRC (e.g. cloaks or channels), refer to #wikimedia-ops instead or check meta:IRC/Cloaks.	Data Engineering
IRC Bots	Issues with bot tools on Libera IRC that are not in "WM-Bot" or "Wikibugs". Cloak/channel requests etc should go to #wikimedia-ops or to meta. See meta:IRC/Cloaks.	(Active volunteer)	Petr Bena
ircservserv	Manages IRC channel configuration through declarative files in Git.	(Active volunteer)	Legoktm, Taavi
Kask	Kask is an opaque key-value data store with a RESTful (HTTP) interface.	Unassigned	formerly Core Platform Team
Mailing lists	Issues relating to the mailing lists/Mailman. See: m:Mailing lists/Administration, https://lists.wikimedia.org, https://wikitech.wikimedia.org/wiki/Mailman	SRE	Ladsgroup, Legoktm
Mathoid	Mathoid is being phased out as part of RESTBase sunsetting (T338429)	Unassigned	Template:U, formerly Wikimedia Services team
Media storage	Storage infrastructure for images, videos and other media files from Wikimedia Commons and other wikis. Currently based on Swift.	SRE (Template:U, Template:U)
Icinga	[1]	SRE
ipoid	The ipoid service provides an API for retrieving reputation data for individual IP addresses, as well as retrieving lists of IP addresses matching a particular set of labels (e.g. list of IP addresses that are associated with VPNs).	Trust and Safety Product
NOC	contains public copies of our configuration files. https://noc.wikimedia.org and https://wikitech.wikimedia.org/wiki/noc.wikimedia.org	Unassigned
ORES	ORES / ores.wikimedia.org	Scoring platform team
performance.wikimedia.org	The performance.wikimedia.org portal, including the Excimer UI (excimer-ui-client, excimer-ui-server), and XHGui web apps (Phabricator).	SRE Observability	formerly Performance Team
Phabricator	Configuration of Wikimedia's Phabricator installation. See: https://wikitech.wikimedia.org/wiki/Phabricator	Release Engineering	Andre Klapper, and administrators
Phatality	OpenSearch Dashboards plugin to easily associate errors with Phabricator Tasks.	Ahmon Dancy, Brennen Bearnes, Cole White, Jaime Nuche
php-excimer	Low-overhead sampling profiler and interrupt timer.	MediaWiki Engineering (MediaWiki Platform Team)	Tim Starling
php-luasandbox	Safely execute untrusted Lua 5.1 code.	Unassigned	Tim Starling
php-wikidiff2	Fast diff engine.	WMDE Engineering (contact EMs)	Tim Starling
php-wmerrors	Extended error handling and display.	Unassigned	Tim Starling, formerly Performance Team
poolcounter	Low-latency mutex deamon to protect against load spikes (Gerrit, Phabricator).	MediaWiki Engineering (MediaWiki Platform Team)	Tim Starling
Proton	Render PDF versions of Wikipedia articles.	MediaWiki Engineering (Content Transform Team)
PyBal	Automation and monitoring for LVS.	SRE Traffic (Valentin Gutierrez), and SREService Ops (Giuseppe Lavagetto)
RESTBase	Wikimedia REST API (aka RESTBase) is an API router in front of certain Node.js services, i.e. Citoid, Mathoid (formerly: Parsoid, Graphoid).	Unassigned	formerly Core Platform Team
RT	https://rt.wikimedia.org - managing the procurement queue. https://wikitech.wikimedia.org/wiki/RT	SRE
Statsv	Intake service for stats from MediaWiki JavaScript, forwarding it to Statsd/Graphite.	SRE Observability	formerly Performance Team
Shellbox	Secure and isolated execution of external libraries, such as Lilypond (for MediaWiki Score extension), and Pygments (for MediaWiki SyntaxHighlight extension). The service runs in Kubernetes and uses the Shellbox PHP library, which is lacking an owner (listed above under Libraries)	SRE ServiceOps
Snapshots	Snapshots of MediaWiki content provided in datasets for external re-use. https://dumps.wikimedia.org https://wikitech.wikimedia.org/wiki/Dumps WMF Projects/Data Dumps	Unassigned	Template:U, formerly Core Platform Team, WMCS, WMDE Engineering (contact EMs)
Technical Blog	The Wikimedia Tech Blog, a WordPress installation (hosted by Automattic.com). Source code	Wikimedia Developer Advocacy Team
Thumbor	Thumbnail service for Wikimedia wikis, especially rendering of SVG files (which represents the majority of thumbnail-related configuration requests and upgrades).	Unassigned	TheDJ?
Vagrant (mediawiki-vagrant)	Virtual environment for bootstrapping MediaWiki development	Release Engineering (as of 2016-09-21)
VRT System	The platform used for the Volunteer Response Team, historicaly based on the OTRS software. https://ticket.wikimedia.org	SRE > Service Operations	User:Madman, Peter Gervai
wikibugs IRC bot	Announces changes to Phabricator tasks on IRC - https://wikitech.wikimedia.org/wiki/wikibugs	Legoktm, Valhallasw
Wikimedia Portals	Wikimedia Portals	Web	JDrewniak
XHGui	Graphical interface for PHP profiling data captured by WikimediaDebug.	SRE Observability.	formerly Performance Team
Sanitarium	The redaction process ("redactatron") that hosts and prepares production databases such that they can safely replica public information to Wikimedia Cloud Services.	SRE Data Persistence (Jaime Crespo is most familar, but not maintainer)
varnishkafka	Aggregate and transport in-memory logs from all Varnish frontend CDN nodes into Kafka for offline processing.	SRE > Traffic (Valentin Gutierrez)
WikiKube	The "WikiKube" Kubernetes cluster, and the MediaWiki-on-Kubernetes helm charts, power all Wikimedia Foundation wikis. This includes configuration of Apache and PHP (such as for portals, rewrites rules). Phabricator: Wikimedia-Apache-conf, MW-on-K8s.	SRE > Service Operations
Wikidata Query Service	See also SLO/WDQS.	Search Platform
WikimediaDebug	Debug and profile MediaWiki web requests in production.	Release Engineering
wikimediafoundation.org	https://techblog.wikimedia.org/, a WordPress install hosted by Automattic.com, https://blog.wikimedia.org. Source code	WMF Communications Team
Wikitech wiki	Provides documentation related to the technical projects and infrastructure maintained by the Wikimedia Foundation - https://wikitech.wikimedia.org, https://wikitech.wikimedia.org/wiki/wikitech	Wikimedia Cloud Services team
Zotero translation-server	Service that is in support of the citoid service.	Editing team

Data Platform

Template:See also

Service	Repository	Issue tracker	Steward	Maintainers
Event Metrics	GitHub	Phabricator	Data Platform Engineering	MusikAnimal, Samwilson, HMonroy
Dashiki	Gerrit	Phabricator	Data Platform Engineering	Dan Andreescu
Wikistats 2	Gerrit	Phabricator	Data Platform Engineering	Dan Andreescu, Marcel Ruiz Forns
Refinery and Datasets	Gerrit	Phabricator	Data Platform Engineering
Hadoop Cluster	Gerrit	Phabricator	Data Platform Engineering
Airflow	Gitlab	Phabricator	Data Platform Engineering
DataHub	Gerrit	Phabricator	Data Platform Engineering
Event Platform	Gerrit (multiple; check docs)	Phabricator	Data Platform Engineering	Andrew Otto
Turnilo			Data Platform Engineering
Wmfdata-Python	GitLab	Phabricator	Data Platform Engineering, Movement Insights	Neil Shah-Quinn, Xabriel Collazo Mojica, Fabian Kaelin

Misc

These include a selection of Toolforge tools and Cloud VPS projects that are maintained by Wikimedia Foundation and/or heavily used as part of the development process.

Component	Repository	Issue tracker	Steward	Maintainers	Note
Beta Cluster			Unassigned	Nobody	beta.wmflabs.org
Codesearch	Gerrit	Phabricator	Unassigned
Wikipedia Android app	GitHub	Phabricator	WMF Mobile Apps team
Wikipedia for iOS	GitHub	Phabricator	WMF Mobile Apps team
MediaWiki config at WMF	Gerrit	Phabricator	Release Engineering (as of 2016-09-21)	Sam Reed	MediaWiki configuration of Wikimedia Foundation sites.
LibUp	GitLab	Phabricator	Unassigned	Template:U	LibUp (aka libraryupgrader) is a semi-automatic service that upgrades libraries and other developer dependencies for all our software repositories hosted on Gerrit.
patchdemo.wmflabs.org			Unassigned	Bartosz and Ed are volunteer maintainers	Used for spinning up test instances with in progress Gerrit patches Report bugs here
pixel.wmcloud.org			QTE	Web	Visual regression testing
MediaWiki interwiki map at WMF	Gerrit	Phabricator	Unassigned	Template:U

Sites

This table lists tools and sites which benefit from clarity around ownership as they behave differently to other sites, or have their own deploy processes outside the standard train.

Component	Description	Steward	Maintainers
www.wikipedia.org	Wikipedia Portal (outdated)	Web	Jan Drewniak
donate.wikimedia.org / thankyou.wikipedia.org	Production wikis, notable for being used exclusively for Fundraising purposes.	Fundraising tech, WMF Advancement
payments.wikimedia.org	External wiki dealing with sensitive deta, hosted separately, in the "payments" cluster. See also wikitech:payments.wikimedia.org.	Fundraising tech, WMF Advancement
enterprise.wikimedia.org	Wikimedia Enterprise	Wikimedia Enterprise
translatewiki.net	Translations (independent project)	Language and Product Localization

Other areas of focus

(Not all of them fit in current projects.)

• User experience, user interface and visual design: the Wikimedia Design group members and others
  • Design System Codex: Design System Team
• Multilingual aspects: Nikerabbit and others.

See also

• Upstream projects
• Code Stewardship
• doc.wikimedia.org: includes libraries Wikimedia publishes, developer dependencies, and projects not used by MediaWiki.
• Gerrit's list of MediaWiki group members (core developers with +2 on all MediaWiki repositories).
• https://www.openhub.net/p/mediawiki/contributors can be useful to see which developers are active.

References

[[Category:MediaWiki development{{#translation:}}]]