The Free / Libre / Open Source Web App with the most built-in features
Project management web application
Open Source Enterprise Wiki and Web Application Platform
Embeddable/J2E/Desktop Java Wiki CMS
Piggydb helps you have more fun with knowledge creation.
Make robots for MediaWiki-powered sites!
Web-based knowledge base template.
doc cms + more
A Trac plugin to allow pasting screenshots or images with one click