Dolphin Smart Community Builder is a flexible, free, open source software that allows you to build any kind of online community, social network or dating website.
Dolphin is a downloadable package, that you control, hold and can change the way you need. It is based on PHP/MySQL and uses AJAX/XHTML, AdobeAIR and Flash. Dolphin comes with iPhone app and desktop application based on AdobeAIR.
Dolphin includes blogs, events, groups, video chat, video player, customizable profiles, friends, boards, media sharing, store, files sharing and many other features.