Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
Fractal planet and terrain generator
a very lightweight advanced terrain-rendering and 3D map rendering sys
3D .NET engine for Windows, Linux, Mac
realtime 3d surface rendering library
extreme 3D flight simulator with advanced terrain rendering
3D Interactive sandbox environment
3D vehicle simulator based on Lagrangian dynamics to simulate dynamics
Pear3DEngine is a modern and modular 3D development framework
realistic truck & car simulator, with OpenGL graphics
remake of the classic STUNTS game, but more realistic; more like GTA 3
ASCII-Art variant of the CTruck3D _Open truck/car simulator
This project has moved to http://www.volumesoffun.com
1st 3D game engine built in C# for .NET, Visual3D Engine's predecessor