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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.
TinyPunk is a MUD codebase written in Python. TinyPunk aims to be quick, easy, and fun, for players and coders alike. Currently it relies on Python 2.6 and the Twisted Framework. It is inspired by tbaMUD, and CircleMUD before it.
Zen Worlds is an object oriented C++ virtual worlds / MMO game engine framework. This project includes Zen Engine game engine client, Zen Enterprise, an Enterprise Service Bus, and a C++ Application Server, and Zen Studio, a game development IDE.