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

An open source turn based strategy game.

An isometric, 2D, dark fantasy action RPG.

The automation tower defense game

Naev is a 2d action/rpg space game that combines elements from the action, rpg and simulation genres.

Open source 2-D freeform space mystery game.

Open Source Pixelart Sci-Fi Real Time Strategy Game

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

modernization of the original Master of Orion

A go kart racing game featuring Tux & Friends

An open-source party game

Reinforcements are rolling in!

An open source game about evolution

Open source 4X civilization-building game

Multiplayer RTS