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.
A web forum written in PHP using a selectable SQL backend
The Free & Popular MediaWiki Web Software in Complete Virtual Machine
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
Make robots for MediaWiki-powered sites!
A Trac plugin to allow pasting screenshots or images with one click
Small and Simple Wiki