A real-time 3D Engine written in Ada
Xj3D is an open-source Java codebase for the X3D Graphics standard.
realistic driving simulation + functions for 2D/3D graphics
A real time 3D graphics engine written in C++
3D .NET engine for Windows, Linux, Mac
Design and Display Happy Cube solutions
Pear3DEngine is a modern and modular 3D development framework
https://github.com/horde3d/Horde3D