Social Source Commons

A full-featured, Free Source Software (GNU/LGPL), multilingual, Wiki/CMS/Groupware written in PHP and maintained by an active and international community of volunteer contributors.

Major features include articles, forums, newsletters, blogs, a file/image gallery, a Wiki, drawing, trackers, a directory, polls/surveys and quizzes, a FAQ, chat, a banner management system, Webmail, a calendar, maps, charts, Mobile Tiki (PDA and WAP access), RSS feeds, a category system, a theme control center, workflow, live support, Shoutbox, ACLs, and more.