Echowaves.com is an opensource web based group chat software written in RubyOnRails. The source code is actually hosted at: http://github.com/dmitryame/echowaves
EchoWaves is a YACT ( Yet Another Collaboration Tool ). It's actually beginning to take a shape of a YASN ( Yet Another Social Network ). So, what's so special about our YASN, well, it's built around conversations rather than users. We think it's more natural for humans to socialize around conversations.