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Kune is a free/libre distributed collaborative social network focused on: the collaborative edition in real time of free contents, thinking on the collaborative work of collectives and organizations; its publishing on the web; and the communication in social network among social movements, academic ... [More]
Dolphin - Smart Community Builder. It is the universal web community script written in PHP and MySQL. Dolphin has a lot of features: Innovative Builders for site customization, Groups, Classifieds and Events , Tags, Rss feeds, Flash Promo and much more
Social Stream is an open source platform on which to build websites with social networking features.