Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
Spring is a versatile 3D RTS game engine. Using extensively Lua for scripting game-specific code to make nearly every aspect of the engine customizable, from GUI, to unit AI, to pathfinding.
Palomino was an unfinished action/combat flight simulator. Air-to-air combat mode was never implemented. However, it does have a land-on-carrier and shoot-SAMs missions.
Requires OpenSceneGraph. Optional: SDL, FLTK.
A relatively easy to win but feature rich fantasy roguelike game with a highly interactive world. Avanor was once a great land, but now it is an isolated valley kingdom under serious threat. You, as the hero must save Avanor, or dominate it.