The Free / Libre / Open Source Web App with the most built-in features
WackoWiki is a light and easy to install multilingual Wiki-engine.
Wiki generator and Java Help System
Embeddable/J2E/Desktop Java Wiki CMS
pH7 Doc Script with support for multiple languages and Ajax navigation
Web-based knowledge base template.
Lightweight extensible wiki engine
SuperWikia: The Runtime/Realtime Environment for Codesmiths
KnowWE has moved, please see http://d3web.sourceforge.net
The Halo extension extends MediaWiki and Semantic Mediawiki
advanced search for mediawiki