Pear3DEngine is a modern and modular 3D development framework
Minimalist 3D Scenegraph Management Framework
https://github.com/horde3d/Horde3D
Multi-Language Wrapper Collection for the Irrlicht Engine
A library to create anaglyph images with Java
PixelLight is a cross-platform application framework
A 3D rendering / entity engine
Game engine supporting many 3D/2D formats and graphic effects
A C++ library to easily create GUI-editable objects