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An open source game about evolution

Open source 4X civilization-building game

An open source turn based strategy game.

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

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

A game of lonely space adventure. http://pioneerspacesim.net/

Topdown tactical RPG roguelike game

Tactical scale World War 2 turn based strategy game, that puts the player in the role of an Axis or Allied army general.

Multiplayer RTS

Free Flight Sim for LINUX with 50 WW2 Aircraft

A city building simulation game

Chisel through a layer cake of thousand-year-old civilizations.

The automation tower defense game

Real time tactics with Newtonian physics

A fantasy console for making, playing and sharing cute 32k cartridges.

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

Free and open source 2D and 3D game engine

modernization of the original Master of Orion

2D Dogfighting with an Army

Brawl in space between Juri Gagarin and John Glenn.

A free digital tactical card game with a surreal fantasy theme.

Spaceflight programming adventure

... in space, which are not infringing on any copyright or anything because this is just a learning exercise.

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

The HTML5 2D+3D game maker. Open source and collaborative.