The Clue! / Der Clou!
Free MMORPG
3D urban environment renderer : browser-app ; as well as a GTA clone
OpenKore is an automation tool for Ragnarok Online
A 2D Adventure Game & Engine
The IRC's Talking Robot
The Map-Editor of the 2D role-playing game Arengu
A retro style video game engine for RPGs and adventure games.
Anathema has moved to http://anathema.github.com
EPIC is an indepth Multiplayer Strategy RPG Web Game