AI4D is an 3D framework to help the students of Artificial Intelligence. You can download the "mega ultra beta" version by CVS. Actually i only tested it on Linux. But probably will work if you put the DLL in the path. I really like help to make it bet
GMUVE (Graphical Multiuser Virtual Environment) is an engine/framework that lets large numbers of users interact in a 3D world. GMUVE is a peer to peer networked OpenGL application that can be used for MMPOG or 3D chat. It is available in Python and JAVA