Dolphin : Dolphin is the world's most advanced community software.
Dolphin

Dolphin Screenshot
Overview
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!

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Features

Create your own kick-ass community site!
Online dating software, social networking software and an advanced CMS - all in one, all finely tuned.
Open source. Open community. Open borders.
Forums, Photos, Video, Music, Blogs, Polls, Events, Groups, Chat, Messenger, Boards, Design Templates and Languages!