Browse free open source Real Time Strategy games and projects for Windows below. Use the toggles on the left to filter open source Real Time Strategy games by OS, license, language, programming language, and project status.
RTS game with the theme of Strategy by Design
0 A.D. is a free, open-source, cross-platform real-time strategy game.
Arianne is an engine to develop multiplayer online games like Stendhal
Real Time Strategy game engine supporting early Westwood classics
Remake of the classic Caesar III game
Dune II strategy and city building on Arrakis
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
Endless Sky is a sandbox-style space exploration game
Widelands is a free, open source real-time strategy game
A simple turn-based artillery game and also a real-time strategy game.
Seven Kingdoms: Ancient Adversaries
The forever free, ad-free and open source chess server
Open source clone of the Age of Empires II engine
An adaptive skirmish AI for Warzone 2100.
Open source FPS/RTS Game
Cross-platform, GPL reimplementation of the classic : Syndicate
Classic Dune. Modern Controls.
Command and Conquer: Red Alert original source code
Modification for Age of Empires III