EchoWaves - Opensource Social Group Chat written in Ruby On Rails
Stealthy: Secret Messenger - Chat anonymously with friends & strangers
Shtuff Chat - Free Group / Team chat with persistent history.
Whisper.sh - Whisper is the best place to express yourself online. Connect with likeminded individuals and discover the unseen world around you.
Anologue - Disposable online chat.
YouHue - A fun new way to ask "How are you?"