MV3D is an open source virtual world simulation framework written in Python. It was designed with scalability in mind and aims to be able to distribute a world across as many servers as needed while dynamically balancing the load.
!!!NOTE: THIS PROJECT HAS MOVED TO GITHUB!!! RingMUD is an extensible MUD (multi-user dungeon) engine and utility set that draws inspiration from popular tabletop RPG systems and adds a dash or two of its own flavor.