The Free / Libre / Open Source Web App with the most built-in features
nhnb's Wiki Tools
Open Source Enterprise Wiki and Web Application Platform
The collection of extensions for MediaWiki software.
Make robots for MediaWiki-powered sites!
Emacs extension for interacting with Atlassian Confluence
The Halo extension extends MediaWiki and Semantic Mediawiki
MediaWiki extension to create flowcharts from the links between pages.