Fully async, multithreaded, predictive, open source, 3.01 reach
Arianne is an engine to develop multiplayer online games like Stendhal
Full featured MUD server with all the trimmings.
TKD Scoring Wi-Fi Server supporting Android and IPhone clients
Java Settlers
Free MMORPG
Aire de jeu de Belote en ligne
Moved to http://www.fuzzball.org
A Twitch Chat Client
Java decentralized cross-platform network multiplayer game engine
A turn-based multiplayer shooting game in the style of Worms
SkipBo! server and Qt client
The IRC's Talking Robot
Source for the Flash-based Glitch client
The original Xivio.com World Server Core
Cross platform administration tool for Source Engine dedicated servers