Arianne is an engine to develop multiplayer online games like Stendhal
A multiplatform medieval 3D MMORPG
Source of Mana is a unique 2D MMORPG
GameServer is a sophisticated, game server designed for online games
New version of PTkEI2, the cross-platform GUI client for Wolfpack Empi
Makes running a PSO server on Linux easier
Proyecto basado en L2jFrozen 1132
Free MMORPG
GameWhizzards is a user created, Open Source 3D MMORPG
starrydb is game server engine
online 4X browser game engine
PvP, MUD RPG.
Massively multiplayer online game server and client framework
WTP is a League of Legends ping checker.
OpenKore is an automation tool for Ragnarok Online
MMORP Game for Russian players.
MMOG Framework. Starting place to build a game.