Safer Instant Messaging
Client-server networking library
The BattleShip is an online game developed in Java.
A small, reliable, local network messenger that doesn't need internet
Self-hosted chat app for small teams
Instant Messenger Application
Moved to http://www.fuzzball.org
An IRC server written in Ruby
A small (ish) messaging server for anything you can think of
A Work-In-Progress, Full-Featured, Open Source IRC Client
free chat system
It can add a chat room with Flash & HTML 5 Client into SMF.
simple yahoo messenger client
A simple Server-Client Chat
The IRC's Talking Robot
Basic Chat program between client and server using c#
Secure chat and conferencing protocol