Open Source Virtual World and MMOG Development Platform
3D Client (Windows), Server, and Tools to easily create massively multiplayer games and virtual worlds.
If you want to contribute to the source code please go to https://github.com/multiversemmo/MultiversePlatform
Habanero3d is a object-oriented 3d game engine written in C++, OpenGL, and GLSL with set of additional tools (written in number of languages), to make developers' life easier.
Habanero3d is targeted for indie games, and is in development.