MV3D is an open source virtual world and multiplayer game framework written in Python. It was designed with scalability in mind and is able to distribute a world across as many servers as needed while dynamically balancing the load. The simulation framework is not specifically slanted towards any one genre of online game, and can just as easily be used for a space game as a fantasy setting. Objects on an MV3D server are simulated using the ODE physics engine. A single server can host thousands of simulated objects. MV3D can use either Python-Ogre or Panda3D on the client for visuals.
For more information on MV3D and this or future releases, please visit the website. The full release notes for version 0.6 are available online as well. For further inquiries, email mike at mv3d dot com or stop by our IRC channel on irc.freenode.net #MV3D.