TikiWiki

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TikiWiki (Tiki) is your Groupware/CMS (Content Management System) solution. Tiki has the features you need:
* Wikis (like Wikipedia)
* Forums (like phpBB)
* Blogs (like WordPress)
* Articles (like Digg)
* Image Gallery (like Flickr)
* Map Server (like Google Maps)
* Link Directory (like DMOZ)
* Multilingual (like Babel Fish)
* Bug tracker (like Bugzilla)
* Free source software (LGPL)

http://www.tikiwiki.org