Free & Open Source Strategy Games
380 free, open-source strategy games — real clones and remakes you can download, inspect the source of, and modify. Not just free to play: the code itself is open.
Active
Archived
Original game image
Original game imageClone of World in Conflict
An open-sourced revival of World in Conflict's Massgate server, letting anyone self-host the game's online multiplayer backend.
Platforms:Windows
Stars1,134
Updated8 years ago
LicenseGPL-2.0
Release2017
Genre: Real-Time Tactics
Theme: —
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
Updated3 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
Updated1 month ago
LicenseGPL-3.0
Release2019
Genre: Real-Time Strategy
Theme: Sci-Fi
Active
Original game image
Original game imageClone of Master of Orion
FreeOrion is an open-source, turn-based 4X space empire game with scripting support for community-customized mechanics and content.
Platforms:WindowsLinuxOSX
Stars1,042
Updated1 month ago
LicenseUnknown
Release2015
Genre: Turn-Based Strategy
Theme: Sci-Fi
Active
Clone of Dungeon Keeper
KeeperFX is an open-source expansion and remake of Dungeon Keeper for modern Windows, requiring the player's own original game files.
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
Updated2 months 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
Updated1 month 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
Updated1 month ago
LicenseGPL-2.0
Release2013
Genre: Real-Time Strategy
Theme: Sci-Fi
Halted
Original game image
Original game imageClone of Command & Conquer
This is a fan-made recreation of the original Command & Conquer RTS game, built as an HTML5/JavaScript technical proof of concept.
Platforms:Web
Stars806
Updated6 years ago
LicenseUnknown
Release2012
Genre: Real-Time Strategy
Theme: Modern Military
Active
Clone of Sid Meier's Colonization
An open-source, GPL-licensed turn-based strategy game cloning Colonization closely, adding an isometric map and multiplayer support.
Platforms:WindowsLinuxOSX
Stars711
Updated1 month ago
LicenseGPL-2.0
Release2017
Genre: Turn-Based Strategy
Theme: —
Halted
Original game image
Original game imageClone of Command & Conquer: Generals
An open-source rewrite of Command & Conquer Generals: Zero Hour, currently requiring the original game's binary.
Platforms:Windows
Stars690
Updated2 years ago
LicenseGPL-2.0
Release2017
Genre: Real-Time Strategy
Theme: Sci-Fi
Active
Clone of Civilization III
A fan-made, mod-friendly Civilization III remake built with Godot and C#, currently in pre-alpha.
Platforms:WindowsLinuxOSX
Stars656
Updated1 month ago
LicenseMIT
Release2021
Genre: Turn-Based Strategy
Theme: —
Active
Clone of Sid Meier's Alpha Centauri
An unofficial open-source reimplementation of Sid Meier's Alpha Centauri and Alien Crossfire, requiring a legally owned original copy.
Platforms:WindowsLinux
Stars631
Updated2 months ago
LicenseAGPL-3.0
Release2023
Genre: Turn-Based Strategy
Theme: —
Halted
Clone of Dwarf Fortress
An open-source, procedurally generated fantasy RTS/tycoon game where you manage a dwarf colony mining resources and fighting for profit.
Active
Clone of X-COM: Apocalypse
An alpha reimplementation of X-COM: Apocalypse with modding, a skirmish mode and modern resolutions; it needs the original files.
Halted
Clone of SimTower
An unfinished, unplayable open-source C++ remake of SimTower that needs the original game's SIMTOWER.EXE to run.
Platforms:WindowsLinuxOSX
Stars591
Updated7 years ago
LicenseGPL-2.0
Release2010
Genre: Simulation
Theme: Management
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
Updated2 months ago
LicenseGPL-2.0
Release2013
Genre: Real-Time Strategy
Theme: Medieval
Active
Clone of Worms Series
A turn-based strategy game where teams of up to eight hedgehogs battle with over 40 weapons on terrain that deforms as it's damaged.
Platforms:WindowsLinuxOSX
Stars560
Updated2 months ago
LicenseGPL-2.0
Release2013
Genre: Turn-Based Strategy
Theme: —
Active
Original game image
Original game imageClone of Warcraft III
Warsmash is an unofficial Java/LibGDX Warcraft III emulator that requires your own copy of the original game's assets.
Platforms:Windows
Stars559
Updated2 months ago
LicenseAGPL-3.0
Release2021
Genre: Real-Time Strategy
Theme: Fantasy
Active
Original game image
Original game imageClone of Command & Conquer: Tiberian Sun
OpenTS is an open-source reconstruction of the Tiberian Sun 2.03 Firestorm engine as a standalone program.
Stars556
Updated1 month ago
LicenseUnknown
Release2026
Genre: real-time strategy
Theme: —
Active
Clone of Victoria II
A rewrite of the open-source Victoria II engine clone Open V2, requiring the original game's files to run.
Platforms:WindowsLinux
Stars547
Updated1 month ago
LicenseGPL-3.0
Release2023
Genre: Real-Time Tactics
Theme: Alternate Historical
Active
Clone of Jagged Alliance 2
A community-maintained continuation of JA2-Stracciatella, running Jagged Alliance 2 on modern systems using data from an original copy.
Active
Original game image
Original game imageClone of OGame
A single-player browser space strategy game inspired by OGame, built with Vue 3 and TypeScript, with all data stored locally.
Platforms:Web
Stars516
Updated4 months ago
LicenseUnknown
Release2025
Genre: Turn-Based Strategy
Theme: Sci-Fi
Sporadic
Clone of Dungeon Keeper
An open-source dungeon-building RTS inspired by Dungeon Keeper, now mostly archived in favour of the OpenDungeonsPlus fork.
Platforms:WindowsLinux
Stars503
Updated1 year ago
LicenseUnknown
Release2014
Genre: Simulation
Theme: Horror
Active
Original game image
Original game imageClone of Dungeon Keeper 2
A Java/jMonkeyEngine remake of Dungeon Keeper II aiming for a faithful version 1.7 using the original game assets.
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
Updated1 month ago
LicenseAGPL-3.0
Release2017
Genre: Real-Time Strategy
Theme: Fantasy
Active
Clone of Victoria II
An in-development Godot 4 open-source project based on Paradox's Victoria II, not yet playable.
Platforms:WindowsLinuxOSX
Stars471
Updated1 month ago
LicenseMIT
Release2023
Genre: Real-Time Tactics
Theme: Alternate Historical
ActiveOriginal game image
Original game imageClone of Command & Conquer
A portable open-source reimplementation of the original Command & Conquer engine, running Tiberian Dawn and Red Alert.
Platforms:WindowsLinuxOSX
Stars462
Updated3 months ago
LicenseUnknown
Release2020
Genre: Real-Time Strategy
Theme: Modern Military
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
Updated2 months 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
Sporadic
Clone of Advance Wars
An open-source turn-based strategy game in voxel art, the sequel to Tanks of Freedom, with a built-in map editor.
Platforms:WindowsLinux
Stars426
Updated1 year ago
LicenseUnknown
Release2019
Genre: Turn-Based Strategy
Theme: —
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
Updated4 months ago
LicenseUnknown
Release2013
Genre: Real-Time Strategy
Theme: Medieval
Active
Original game image
Original game imageClone of Battle Isle 2220
A static recompiler that rebuilds classic DOS/Windows games like X-COM and Warcraft: Orcs & Humans as native modern builds.
Platforms:WindowsLinux
Stars416
Updated2 months ago
LicenseUnknown
Release2016
Genre: Turn-Based Strategy
Theme: —
Halted
Clone of Cortex Command
CCOSS is the open-source release of Cortex Command's engine under AGPLv3, without game data, requiring the original game and Steam DLLs.
Sporadic
Active
Original game image
Original game imageClone of Dune 2
Dune II - The Maker is an actively maintained Dune 2 remake built with CMake and GCC, with documented builds for Windows, Ubuntu, and macOS.
Platforms:WindowsLinuxOSX
Stars364
Updated1 month ago
LicenseUnknown
Release2012
Genre: Real-Time Strategy
Theme: Sci-Fi
Active
Clone of Pikmin 2
A work-in-progress decompilation of Pikmin 2 whose non-matching build can be modded by editing its C++ source.
Platforms:GameCube
Stars364
Updated1 month ago
LicenseCC0-1.0
Release2021
Genre: Real-Time Strategy
Theme: Fantasy