Ever wanted to develop a Massive Multiplayer Online Game (MMOG)? But didn't have the resources, man power or money to develop the engine and all the framework!?
Well, now you can with Multiverse.
Multiverse provides, framework, examples, protocol. All you need to get started.
You get a server, client and some tools, to help with models.
It's developed in Java (server), C# (client), supports plugins and scripts in Python, Java or C# to evolve or customize it.