Free & Open Source World War II Games
28 free, open-source world war ii games — real clones and remakes you can download, inspect the source of, and modify.
Active
Clone of War Thunder
Dagor Engine is Gaijin Entertainment's official open-source release of the engine behind War Thunder, with a full build toolkit.
Platforms:Windows
Stars2,962
Updated2 months ago
LicenseUnknown
Release2023
Genre: Action
Theme: Modern Military
Halted
Clone of Ace of Spades
An open-source, cross-platform client for Ace of Spades 0.75 that connects to vanilla, pyspades and pysnip servers.
Platforms:WindowsOSX
Stars1,245
Updated2 years ago
LicenseGPL-3.0
Release2013
Genre: FPS
Theme: World War II
Sporadic
Original game image
Original game imageClone of WWII GI
Raze is a GZDoom-powered source port that runs Duke Nukem 3D, Blood, Shadow Warrior, and other Build-engine games.
Platforms:WindowsOSX
Stars885
Updated11 months ago
LicenseUnknown
Release2019
Genre: FPS
Theme: World War II
Halted
Original game image
Original game imageClone of Return to Castle Wolfenstein
iortcw is a modernized baseline engine for Return to Castle Wolfenstein and its mods, with development now halted but still playable.
Active
Clone of Wolfenstein: Enemy Territory
An open-source continuation of Wolfenstein: Enemy Territory with a modernized, compatible engine plus a feature-adding Legacy mod.
Platforms:WindowsLinuxOSX
Stars718
Updated1 month ago
LicenseGPL-3.0
Release2020
Genre: FPS
Theme: World War II
HaltedOriginal game image
Original game imageClone of Return to Castle Wolfenstein
Official id Software GPL source release of Return to Castle Wolfenstein's single-player code; game data isn't included.
Halted
Original game image
Original game imageClone of Wolfenstein: Enemy Territory
id Software's GPL release of Wolfenstein: Enemy Territory, the free multiplayer FPS spun off from Return to Castle Wolfenstein.
Platforms:WindowsLinux
Stars613
Updated14 years ago
LicenseGPL-3.0
Release2012
Genre: FPS
Theme: World War II
HaltedOriginal game image
Original game imageClone of Return to Castle Wolfenstein
Official id Software GPL source release of Return to Castle Wolfenstein's multiplayer code; game data isn't included.
Halted
Clone of Blitzkrieg
The official 2025 release of Blitzkrieg's singleplayer source code by Nival, under a non-commercial license, needing third-party SDKs.
Platforms:Windows
Stars325
Updated1 year ago
LicenseUnknown
Release2025
Genre: Real-Time Tactics
Theme: World War II
Sporadic
Clone of Blitzkrieg 2
Nival's official 2025 source release of Blitzkrieg 2's C++ engine and assets, under a non-commercial community license.
Platforms:Windows
Stars311
Updated1 year ago
LicenseUnknown
Release2025
Genre: Real-Time Tactics
Theme: World War II
Halted
Clone of Ace of Spades
An open-source reimplementation of the classic "voxlap" Ace of Spades, built without original code, for low-end systems.
Platforms:WindowsLinux
Stars281
Updated1 year ago
LicenseGPL-3.0
Release2016
Genre: FPS
Theme: World War II
Active
Clone of Company of Heroes
A free, open-source WWII real-time strategy game for up to six factions, built on the Spring RTS Engine.
Platforms:WindowsLinux
Stars202
Updated2 months ago
LicenseUnknown
Release2013
Genre: Real-Time Strategy
Theme: World War II
Active
Clone of The Great Escape
A portable C reimplementation of The Great Escape, reverse-engineered from Z80 assembly to run on macOS, Windows, and RISC OS.
Platforms:WindowsLinuxOSX
Stars132
Updated3 months ago
LicenseUnknown
Release2014
Genre: Arcade
Theme: World War II
Halted
Clone of Ace of Spades
Iceball is an open-source, extensible engine and game built on the classic Ace of Spades experience, for Windows, Linux, and macOS.
Platforms:WindowsLinuxOSX
Stars118
Updated5 years ago
LicenseGPL-3.0
Release2012
Genre: FPS
Theme: World War II
Halted
ActiveOriginal game image
Original game imageClone of Return to Castle Wolfenstein
A standalone Android VR port of the Return to Castle Wolfenstein campaign for OpenXR headsets such as Quest and Pico.
SporadicOriginal game image
Original game imageClone of Return to Castle Wolfenstein
A PS Vita port of id Software's open-source Return to Castle Wolfenstein single-player release.
HaltedOriginal game image
Original game imageClone of Wolfenstein: Enemy Territory
A hobby fork of the ET:XreaL id Tech 3 engine for Wolfenstein: Enemy Territory, adding bug fixes and updates.
Platforms:WindowsLinuxOSX
Stars27
Updated1 year ago
LicenseGPL-3.0
Release2020
Genre: FPS
Theme: World War II
Sporadic
Original game image
Original game imageClone of Decision in the Desert
A from-scratch engine that plays the original Atari 8-bit disk images of MicroProse's three Command Series games.
Platforms:WindowsLinux
Stars15
Updated8 months ago
LicenseGPL-2.0
Release2020
Genre: Strategy
Theme: World War II
Sporadic
Clone of Eastern Front (1941)
A from-scratch TypeScript port of Eastern Front 1941, built from disassembled originals, running client-side as a single-page web app.
Platforms:Web
Stars15
Updated9 months ago
LicenseMIT
Release2022
Genre: Turn-Based Strategy
Theme: World War II
ActiveOriginal game image
Original game imageClone of Return to Castle Wolfenstein
A Return to Castle Wolfenstein source port based on iortcw, with a higher tick rate, Steam file detection and a CMake build.
Halted
Clone of World War II In Western Europe
The preserved original DOS source code for W.R. Hutsell's Second World War strategy wargame, kept unedited for history.
Original game image