MediaWiki

From the official MediaWiki website:

MediaWiki is a free software wiki package originally written for Wikipedia. It is now used by several other projects of the non-profit Wikimedia Foundation and by many other wikis, including this very website, the home of MediaWiki.

http://www.mediawiki.org/wiki/MediaWiki

To learn more about this wiki and all the wikis that Wallanet offers go here: http://www.wallanet.com/open_source_packages/wiki