LAN Messenger - LAN Messenger is a decentralized UDP IM-style chat client which supports usernames...
Omegle - Omegle is one of the most popular online chat website allowing user to communicate with anyone without registration.
MyChat - Secure instant messenger for any network
Chatous - Chatous - random chat with real people from all over the world! Make friends with text or video chat.
BORGChat - BORGChat is a LAN messaging software program.
Chatrandom - Chatrandom provides medium to users for having chat at random with different users around the globe.