Irrlicht Engine

I'm sure this is just a typo but:


**Copyright (C) 2008 by Daniel Sudmann **
** **
**This software is provided 'as-is', without any express or implied **
**warranty. In no event will the authors be held liable for any damages **
**arising from the use of this software. **
** **
**Permission ...

http://www.multiverse.net/

I came accross something that you might find interesting.

Its called the Multiverse, and its for MMOG development, in the beta stage (non beta soon) that should already do what you are trying to do. Also as an added bonus, I guess you can change the gameplay via JAVA ...