Pligg CMS provides free software to create your own social publishing website. Start a social networking site in minutes using the Pligg Content Management System without having to spend time and money on development.
Leading open source CMS for Content Management, Document Management and Knowledge Management. Get your intranet, portal, web site or community site up and running in minutes!
XOOPS is an extensible, OO (Object Oriented), easy to use dynamic web content management system written in PHP. XOOPS is the ideal tool for developing small to large dynamic community websites, intra company portals, corporate portals, webl...
Probably the very best of the DIGG clones, this solution offers more than just a social-engine... IT OFFER(S) OPEN-SOURCE SOLUTION(S), which is most important to us average citizens!
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