Apache JSPWiki - Apache JSPWiki is an open source Wiki engine, feature-rich and built around standard JEE components.
OpenVoyce - Openly discuss and vote on ideas, opinions and reactions
DokuWiki - DokuWiki is a simple to use and highly versatile Open Source wiki software that doesn't require a database.
Scrivener - Scrivener is a content-generation tool for composing and structuring documents.
MediaWiki - MediaWiki is a free software wiki package written in PHP, originally for use on Wikipedia.
Lampant - Helping organizations find and act on the best ideas