Free & Open Source RTS Games
117 free, open-source rts games — real clones and remakes you can download, inspect the source of, and modify. Not just free to play: the code itself is open.
Archived
Clone of Command & Conquer: Red Alert
Electronic Arts' official open-source Red Alert engine and code, paired with a Steam re-release bundling the base game and both expansions.
Platforms:Windows
Stars6,702
Updated1 year ago
LicenseGPL3*
Release2024
Genre: Real-Time Strategy
Theme: Modern Military
Archived
Clone of Command & Conquer: Generals
Electronic Arts' official open-source Zero Hour engine and code, paired with a Steam re-release adding Workshop support for community maps.
Platforms:Windows
Stars4,721
Updated1 year ago
LicenseGPL3*
Release2024
Genre: Real-Time Strategy
Theme: Sci-Fi
Archived
Clone of Command & Conquer
Electronic Arts' official open-source release of the Tiberian Dawn engine, paired with a Steam re-release of the campaigns.
Platforms:Windows
Stars1,808
Updated1 year ago
LicenseGPL3*
Release2024
Genre: Real-Time Strategy
Theme: Modern Military
Active
Clone of Perimeter
KD Lab's own official open-source release of the Perimeter engine, paired with a Steam re-release; online play works via LAN or GameRanger.
Platforms:Windows
Stars552
Updated14 days ago
LicenseGPL-3.0
Release2021
Genre: Real-Time Strategy
Theme: Sci-Fi
Archived
Clone of Command & Conquer
Electronic Arts' official source release for the C&C Remastered Collection, supporting Steam Workshop maps and mods for the 4K remaster.
Platforms:Windows
Stars21,391
Updated1 year ago
LicenseUnknown
Release2020
Genre: Real-Time Strategy
Theme: Modern Military
Active
Clone of Command & Conquer
An open-source RTS engine that reimagines Red Alert, Tiberian Dawn and Dune 2000, with online multiplayer and modding tools.
Platforms:WindowsLinuxOSX
Stars17,376
Updated12 days ago
LicenseGPL-3.0
Release2010
Genre: Real-Time Strategy
Theme: Modern Military
Active
Clone of Age of Empires
A free engine clone of Age of Empires' Genie Engine; it needs the original game assets, and gameplay is being rebuilt.
Platforms:Linux
Stars14,432
Updated12 days ago
LicenseUnknown
Release2013
Genre: Real-Time Strategy
Theme: Ancient History
Active
Clone of Total Annihilation
Beyond All Reason is an open-source real-time strategy game built on the Recoil engine, combining a lobby launcher with Lua-based game code.
Platforms:WindowsLinux
Stars4,207
Updated11 days ago
LicenseUnknown
Release2019
Genre: Real-Time Strategy
Theme: Sci-Fi
Halted
Clone of Total Annihilation
An open-source real-time strategy engine descended from Total Annihilation, for Windows, Linux, and macOS.
Platforms:WindowsLinuxOSX
Stars3,997
Updated2 years ago
LicenseUnknown
Release2008
Genre: Real-Time Strategy
Theme: Sci-Fi
Active
Active
Clone of Spore
An open-source evolution sim where you guide a species from a single cell through mutation-driven natural selection.
Platforms:Windows
Stars3,706
Updated11 days ago
LicenseUnknown
Release2012
Genre: Simulation
Theme: Sci-Fi
Active
Clone of The Settlers II
Widelands is a free, open-source RTS inspired by The Settlers II, with singleplayer campaigns, multiplayer, and Lua-scripted scenarios.
Platforms:WindowsLinuxOSX
Stars3,061
Updated11 days ago
LicenseGPL-2.0
Release2019
Genre: Real-Time Strategy
Theme: Medieval
Active
Sporadic
Clone of Command & Conquer: Generals
An early-stage, not-yet-playable open-source re-implementation of EA's SAGE engine, targeting C&C: Generals and Zero Hour.
Platforms:WindowsLinuxOSX
Stars1,635
Updated6 months ago
LicenseUnknown
Release2017
Genre: Real-Time Strategy
Theme: Sci-Fi
Halted
Clone of Star Ruler 2
A massive-scale 4X/RTS set in space, officially open-sourced by original developer Blind Mind Studios.
Platforms:WindowsLinux
Stars1,528
Updated2 years ago
LicenseUnknown
Release2018
Genre: Real-Time Strategy
Theme: Sci-Fi
Active
Active
Clone of Command & Conquer: Red Alert 2
An OpenRA-engine mod recreating Command & Conquer: Red Alert 2 for Windows, Linux, and macOS.
Platforms:WindowsLinuxOSX
Stars1,132
Updated2 months ago
LicenseGPL-3.0
Release2015
Genre: Real-Time Strategy
Theme: Modern Military
Active
Clone of Natural Selection
An open-source arena shooter blending FPS combat with RTS base-building, inspired by mods like Natural Selection.
Active
Clone of Hard Vacuum
An open-content OpenRA real-time strategy game based on Daniel Cook's Hard Vacuum design, with online multiplayer and a map editor.
Platforms:WindowsLinuxOSX
Stars1,071
Updated12 days ago
LicenseGPL-3.0
Release2019
Genre: Real-Time Strategy
Theme: Sci-Fi
Active
Clone of Command & Conquer: Red Alert 2
RA2Web React is a from-scratch TypeScript/React/Three.js rebuild of Red Alert 2's engine, playable in a web browser.
Platforms:Web
Stars965
Updated23 days ago
LicenseUnknown
Release2025
Genre: Real-Time Strategy
Theme: Modern Military
Active
Clone of Anno series
An early, not-yet-playable Godot 4 rewrite of the Anno-style city-building RTS Unknown Horizons.
Platforms:WindowsLinux
Stars902
Updated12 days ago
LicenseGPL-2.0
Release2019
Genre: Real-Time Strategy
Theme: —
Active
Clone of Total Annihilation
An open-source RTS with physical projectiles and smart units, built on the Spring Engine, similar to Total Annihilation.
Platforms:WindowsLinux
Stars827
Updated12 days ago
LicenseGPL-2.0
Release2013
Genre: Real-Time Strategy
Theme: Sci-Fi
Halted
Halted
Active
Clone of The Settlers II
A community-maintained reimplementation of The Settlers II adding internet multiplayer, reusing the original's graphics and sound.
Platforms:WindowsLinuxOSX
Stars588
Updated16 days ago
LicenseGPL-2.0
Release2013
Genre: Real-Time Strategy
Theme: Medieval
Active
Active
Clone of Warcraft III
HiveWE is a fast third-party World Editor replacement for Warcraft III, adding quicker load times and advanced map-editing tools.
Platforms:Windows
Stars473
Updated13 days ago
LicenseAGPL-3.0
Release2017
Genre: Real-Time Strategy
Theme: Fantasy
Active
Active
Clone of Warcraft II
Wargus lets you play Warcraft II with the open-source Stratagus engine, matching the original's look, sound, and gameplay.
Platforms:WindowsLinuxOSX
Stars435
Updated21 days ago
LicenseGPL-2.0
Release2015
Genre: Real-Time Strategy
Theme: Fantasy
Halted
Clone of Age of Empires
Chariot is an early-stage Rust and SDL2 reimplementation of the 1997 Age of Empires engine, with no playable game yet as of 2016.
Platforms:WindowsLinuxOSX
Stars432
Updated8 years ago
LicenseUnknown
Release2016
Genre: Real-Time Strategy
Theme: Ancient History
Active
Clone of Glest
MegaGlest is a free, actively developed 3D real-time strategy game with seven factions across 17 settings, for Windows, Linux, and macOS.
Platforms:WindowsLinuxOSX
Stars420
Updated2 months ago
LicenseUnknown
Release2013
Genre: Real-Time Strategy
Theme: Medieval
Active
Sporadic
Active
Active
Halted
Clone of The Settlers
Freeserf is a remake that requires the original DOS or Amiga data files to run, playable on Windows, Linux, and macOS.
Platforms:WindowsLinuxOSX
Stars338
Updated2 years ago
LicenseGPL-3.0
Release2011
Genre: Real-Time Strategy
Theme: Medieval
Active
Halted
Clone of Stronghold
An open-source engine reimplementation of Stronghold; development is frozen pending Firefly's Definitive Edition release.
Platforms:WindowsLinuxOSX
Stars281
Updated2 years ago
LicenseMIT
Release2019
Genre: Real-Time Strategy
Theme: Medieval
Halted