Client-server networking library
The BattleShip is an online game developed in Java.
this is tcp/ip code
A small, reliable, local network messenger that doesn't need internet
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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
WeChat public platform php development kit, weixin developer SDK
A Work-In-Progress, Full-Featured, Open Source IRC Client
Chat with your friends everywhere, whether you are in space or on eart
XMPP PHP BOT (XPbot) - simple, extensible jabber bot
chat informer client and server applications for chat.php.spb.ru
free chat system
1 on 1 Webcam Videochat Script with P2P Support
The IRC's Talking Robot
It can add a chat room with Flash & HTML 5 Client into SMF.