Arianne is an engine to develop multiplayer online games like Stendhal
An open-source Phantasy Star Online server for *nix
GameServer is a sophisticated, game server designed for online games
2D Open Source MMORPG
Massively multiplayer online game server and client framework
platform for addicted MMORPG players
Yet Another PHP EVE API Library.
Helios fork
Just one more MMORPG in a fantasy world.