Cross-Platform C++ 2D/3D game engine
Cross-platform 2D and 3D game engine with modular architecture
LDraw™ editor for LEGO® style digital building instructions.
OpenGL port of the classic 6dof 3D shooter Descent
3D drape simulation engine using particle based method
A public domain cross platform 3D game
a very lightweight advanced terrain-rendering and 3D map rendering sys
.NET - VISUAL BASIC NVIDIA +ATI PHYSX SLIMDX DIRECTX 9 -ENGINE/WRAPPER
Mahasona engine is an open source game engine.
Arengu is a free 2D RPG with a thrilling story and exciting gameplay.
General Utility Library
A complete 2D Game Engine with built in drag and drop editor