Anologue - Disposable online chat.
Chatib - Chatib is an online chat room where you can meet and chat with new people, make them friends, or even data them online.
EchoWaves - Opensource Social Group Chat written in Ruby On Rails
Bazoocam - Bazoocam is a popular chat website that rapidly connects you with strangers to chat.
JabbR - A chat application built with ASP.NET and SignalR.
MiraMi - Amazing chat roulette MiraMi with a random girl. Guys are matched only with girls.