ErisMUD is a MUD/MOO engine and server written in Python and SQLite and supports many features: it has rooms, chat, NPCs, items, player creation, ANSI colors, etc. Internal commands take care of the development and maintenance.
VTSystem is a 3D (Action) Adventure engine where each character can go about his(her) own affairs independent of your actions, where you can experience 'real world' environments! Uses the Nebula Device. For more information, take a look at the homepage
Project: Dark River Introduction: Dark River is a single player Immersive RPG With RTS Elements. It will be fantasy based and will take place on the world of Antresnia. The world of Antresnia is a vast and beautiful world in the Xeppinia Star System.