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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.
Conquests is a turn-based 4X Civilization-like 3D strategy game for Windows and Linux. You can discover new technologies from the stone age to the space age, explore the world, and wage war on your opponents. It supports both Direct3D and OpenGL graphics, and can run in both 2D and 3D modes.
Palomino was an unfinished action/combat flight simulator. Air-to-aircombat mode was never implemented. However, it does have a land-on-carrier and shoot-SAMs missions.
Requires OpenSceneGraph. Optional: SDL, FLTK.
Lashkar is a 3rd person action/simulation game. Allowing players to choose between different combat vehicles, like (tanks, mechs, choppers, air planes etc). Not true simulation but a blend of fun with simulation.