How to become a MediaWiki hacker/Volunteer achievements

Volunteer developers are the reason that MediaWiki exists. This page is a place to list what's been done by volunteer devs (including those devs whose volunteer work was so helpful that they were later hired to work on MediaWiki professionally).

''Please help expand this list or add dates and links to extensions that were written by volunteers. ''

MediaWiki software

 * Original MediaWiki software: Magnus Manske, Lee Daniel Crocker
 * Wiki tables: Magnus Manske
 * Namespaces: ?
 * Templates: Tim Starling (MW 1.2)
 * Template and MediaWiki namespace: Erik Möller and Tim Starling (MW 1.3)
 * MonoBook skin: Gabriel Wicke, with a design document and a mass of user comments (MW 1.3)
 * Categories: ? (MW 1.4)

Reading

 * The table of contents – Erik Möller

Editing

 * Section editing – Erik Möller
 * Watchlist: ?

Localisation

 * Regular/daily updates from translatewiki.net – Nikerabbit, Siebrand and since 2007 Raymond (including the LocalisationUpdate extension)
 * Committing or enabling all sorts of l10n – Nikerabbit, Brion Vibber, Rob Church, Ævar Arnfjörð Bjarmason, Rotem Liss, Hashar
 * Other l10n/i18n – Huji, Collinj, JeLuF, Reedy, Simetrical, IAlex

Multimedia

 * MediaWiki core uploading infrastructure – Bryan
 * VipsScaler – Bryan

API

 * Original maintainer – Yurik
 * Maintainer 2008?–2013? – Catrope
 * Others – Bryan, IAlex, Reedy

Wikisource tools

 * Wikisource:WSexport – Tpt
 * ProofreadPage - ThomasV (creator) and Tpt (current maintainer)

Other extensions
Some of the Wikimedia projects extensions originally created and/or currently maintained by volunteers:
 * CategoryTree
 * CheckUser
 * Global Usage
 * Interwiki
 * MassMessage
 * Nuke
 * Renameuser
 * SiteMatrix
 * Translate
 * Babel
 * CategoryTree
 * CharInsert
 * EasyTimeline
 * InputBox
 * LabeledSectionTransclusion
 * Poem
 * RSS feed
 * WikiHiero
 * SpamBlacklist
 * ApiSandbox
 * cldr
 * Score – supporting musical scores by User:GrafZahl

And many widely used extensions for non-Wikimedia wikis, like:
 * Most of Semantic MediaWiki – many contributors
 * ConfirmEdit's most used and useful module, QuestyCaptcha – Emufarmers