Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
Realtime 3D engine for game development
Open source first/third person shooter set in real world locations
3D .NET engine for Windows, Linux, Mac
A public domain cross platform 3D game
Dragging and Dropping Components for Multi-projection Applications
Multimedia asset management and manipulator for Étoilé
Java 2D graphics/utility library
TurboSphere is an easy to learn and powerful JS based game engine.
A world editor for HGE game engine written in python and uses OpenGL.
A cross-platform game framework based on OpenGL and GObject.
3D game engine for C and C++
Pear3DEngine is a modern and modular 3D development framework
Access to Irrlicht Engine SDK from assembler, C, Python, Basic, Pascal
Cross-platform reimplementation of AMOS BASIC (runtime)
Alternativa3D Flash GPU accelerated 3D engine
Chess game interface