Azuriom is a complete open-source web solution for game servers
Mangos ZERO is a server for World of Warcraft
Arianne is an engine to develop multiplayer online games like Stendhal
LGSL (Live Game for PHP 5.4-8+: online status for various gameservers
Free MMORPG
A mobile game distributed server implemented using netty4.X
Upload games to legacy apple // computers via serial and no floppies!