Open Source Space Strategy Game

Dark Oberon is an open source real-time strategy game released under the GPL.

It is an open source turn-based strategy game in the tradition of Battle Isle.

The original Reach For The Stars was released in 1983.

Widelands is an open source (GPLed) real-time strategy game.

Miner Wars is a 6DOF underground and space shooter game.

Real Warfare: 1242, is a realistic real-time strategy game.

Is an entertaining free and open source cross-platform 3D realtime strategy game.

Blockem is an open source clone of the board strategy game blokus.

Gigalomania is an open source 2D real time strategy game.

OpenDungeons is an open source, real time strategy game.

Unvanquished is an open-source first-person strategy shooter game.

RimWorld is an indie space colony management game.

Open Game Panel is an open-source web based Game server control panel.

Adds two missions to the base Stronghold Crusader 2 game.

A space strategy adventure game, where you command a space-faring empire.

Star Raid: Inception is a free-to-play space strategy game.

Includes the Company of Heroes 2 game and all its expansions.