The Free / Libre / Open Source Web App with the most built-in features
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WackoWiki is a light and easy to install multilingual Wiki-engine.
Personnal or familly wiki with low ressource requirement.
The Free & Popular MediaWiki Web Software in Complete Virtual Machine
A web forum written in PHP using a selectable SQL backend
Project management web application
Open Source Enterprise Wiki and Web Application Platform
The collection of extensions for MediaWiki software.
Embeddable/J2E/Desktop Java Wiki CMS
Piggydb helps you have more fun with knowledge creation.
Web-based knowledge base template.
Converts wikitext documents into HTML documents
SuperWikia: The Runtime/Realtime Environment for Codesmiths
A Trac plugin to allow pasting screenshots or images with one click
Simplest wiki+tracker system