Open Source MMORPG Framework
A multiplatform medieval 3D MMORPG
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
Source of Mana is a unique 2D MMORPG
Makes running a PSO server on Linux easier
Free MMORPG
An OpenGL client-server game
starrydb is game server engine
Massively multiplayer online game server and client framework
Open Source Virtual World and MMOG Development Platform
Modular Minecraft server plugin - commands, events, ...
Create your own online real-time browser-based MMO in your website
Frontend for Minecraft Server