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Evolution RTS is a free an Open Source RTS game designed using the Spring Engine.

Command the forces of The Project in a battle to rebuild the world.

Open Source Pixelart Sci-Fi Real Time Strategy Game

Multiplayer RTS

Empires Ascendant is a free, open-source, historical Real Time Strategy (RTS) game by Wildfire Games.

Free, cross-platform economy strategy game. Control the fate of a small tribe that can grow into a big empire

Open source 4X civilization-building game

Soft Body Physics Simulator

Recreates the classic Command & Conquer titles with a Free/Libre engine.