Dolphin is the world's most advanced community software. Open-source, independent, downloadable, scalable, customizable, full-featured, free software for building social networks, dating sites and web-communities. Loaded with video chat, recorder, video player, forums, groups, events, video messenger, mailbox, desktop app, video sharing, photo sharing, iPhone app and much more. Build your own business or advance your hobby with Dolphin!
Elgg empowers individuals, groups and institutions to create their own fully-featured social environment. Elgg, started in 2004, is an open source social engine which powers all kinds of social environments - from education and business to martial arts and rugby. If you are looking for a professional social intranet or want to run a site for your organisation, Elgg is a great choice.
Open Source Social Network also know as OSSN is a social networking software written in PHP. Open Source Social Network allows you to make a social networking website, helps your members build social relationships with people who share similar professional or personal interests.