Free & Open Source Clones & Decompilations of Retro Games

4,049 open-source clones, remakes and decompilations of 2,426 retro games — real source code you can read, fork, and play today, not just a free download.

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Archived

Command and Conquer: Red Alert

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

Command & Conquer: Generals - Zero Hour

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

Active

The Legend of Zelda: Majora's Mask (original game, not this project)

Original game image

2 Ship 2 Harkinian

Clone of The Legend of Zelda: Majora's Mask

A native PC/Mac/Linux port of Majora's Mask on the libultraship engine, requiring your own verified ROM dump and no bundled assets.

Platforms:WindowsLinuxOSX

Stars2,283

Updated1 month ago

LicenseCC0-1.0

Release2023

Genre: Action

Theme: Fantasy

Archived

Command and Conquer Tiberian Dawn

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

Sporadic

3d.city

Clone of SimCity

3d.city renders a live city simulation in full 3D via WebGL2 or WebGPU in the browser, using Three.js and the micropolisJS engine.

Platforms:Web

Stars1,750

Updated6 months ago

LicenseGPL3*

Release2014

Genre: Simulation

Theme: Management

Archived

Command & Conquer: Renegade

Clone of Command & Conquer: Renegade

Electronic Arts' official open-source release of the Renegade engine, paired with a Steam re-release adding Workshop support for user maps.

Platforms:Windows

Stars1,630

Updated1 year ago

LicenseGPL3*

Release2024

Genre: FPS

Theme: Modern Military

Halted

Tanks of Freedom

Clone of Advance Wars

Tanks of Freedom is an open-source isometric pixel-art turn-based strategy game built in Godot Engine, with a released sequel.

Platforms:WindowsLinuxOSX

Stars1,208

Updated1 year ago

LicenseMIT*

Release2015

Genre: Turn-Based Strategy

Theme: —

Active

Perimeter

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

Updated2 months ago

LicenseGPL-3.0

Release2021

Genre: Real-Time Strategy

Theme: Sci-Fi

Active

Street Fighter III: 3rd Strike (original game, not this project)

Original game image

3SX

Clone of Street Fighter III: 3rd Strike

3SX is a native PC/Mac/Linux port of Street Fighter III: 3rd Strike with rollback netcode, continuing the 3s-decomp decompilation project.

Platforms:WindowsLinuxOSX

Stars340

Updated1 month ago

LicenseAGPL-3.0

Release2025

Genre: Fighting

Theme: —

Sporadic

Original game image

3S Decomp

Clone of Street Fighter III: 3rd Strike

A matching decompilation of the PS2 release of Street Fighter III: 3rd Strike, with the game's own code fully decompiled.

Platforms:PS2

Stars274

Updated7 months ago

LicenseAGPL-3.0

Release2024

Genre: Fighting

Theme: —

Halted

Remnants of the Precursors

Clone of Master of Orion

Remnants of the Precursors is a modernization of Master of Orion, leading one of ten races to galactic domination with streamlined play.

Platforms:WindowsLinuxOSX

Stars221

Updated3 years ago

LicenseCC-BY-NC-ND, GPL3*

Release2020

Genre: Turn-Based Strategy

Theme: Sci-Fi

Sporadic

Super Tilt Bro

Clone of Super Smash Bros.

A demake of Super Smash Bros. for original NES hardware, distributed on a cartridge with Wi-Fi for online multiplayer.

Platforms:WebWindowsLinux

Stars156

Updated9 months ago

LicenseWTFPL

Release2016

Genre: Fighting

Theme: —

Active

Master of Orion (original game, not this project)

Original game image

1oom-fork

Clone of Master of Orion

A reconstruction of the original 1993 DOS Master of Orion for modern systems, though this fork is no longer actively developed.

Platforms:WindowsLinuxDOS

Stars110

Updated2 months ago

LicenseGPL-2.0

Release2022

Genre: Turn-Based Strategy

Theme: Sci-Fi

Active

OpenCrystalCaves

Clone of Crystal Caves

An unofficial, actively developed open-source engine reimplementation of the Crystal Caves platformer trilogy.

Platforms:WindowsLinux

Stars91

Updated2 months ago

LicenseMIT

Release2017

Genre: Platform

Theme: —

Sporadic

3DGE

Clone of Doom

3DGE is an advanced OpenGL source port built on the id Tech 1 engine, aimed at modders wanting an easy platform for new content.

Platforms:WindowsLinuxOSX

Stars82

Updated11 months ago

LicenseGPL2*

Release2015

Genre: FPS

Theme: Sci-Fi

Sporadic

Brány Skeldalu

Clone of Brány Skeldalu

The game's own official open-source release of the original 1998 Czech dungeon crawler's source, paired with a 2025 Steam re-release.

Platforms:Linux

Stars63

Updated4 months ago

LicenseMIT

Release2025

Genre: RPG

Theme: Fantasy

Sporadic

Yarntown

Clone of Bloodborne

Yarntown is a free fan tribute that reimagines Bloodborne as a Zelda-like top-down action-adventure, built solo with the Solarus engine.

Platforms:Windows

Stars28

Updated10 months ago

LicenseCC-BY-SA, GPL3*

Release2020

Genre: RPG

Theme: Fantasy

Halted

Pac-Man (original game, not this project)

Original game image

3do-wreck-man

Clone of Pac-Man

A from-scratch Pac-Man clone built for real 3DO hardware, playable via the RetroArch Opera core, refactored for a 2023 release.

Platforms:3DO

Stars10

Updated3 years ago

LicenseUnknown

Release2023

Genre: Arcade

Theme: —

Halted

Tetris (original game, not this project)

Original game image

4DTris

Clone of Tetris

Extends Tetris into four spatial dimensions, visualized in real time with OpenGL and GLUT, as a small single-purpose project.

Platforms:Linux

Stars5

Updated1 year ago

LicenseGPL-3.0

Release2016

Genre: Puzzle

Theme: Abstract

God Of Thunder

Clone of God of Thunder

The official freeware release of the original 1994 game, packaged as a self-contained DOSBox build via SourceForge and Steam.

Platforms:DOS

LicensePD*

Genre: Puzzle

Theme: —

Active

Mindustry

Clone of Factorio

An open-source automation tower defense RTS in Java, for desktop, Android and iOS.

Platforms:WindowsLinuxOSX

Stars28,996

Updated1 month ago

LicenseGPL-3.0

Release2017

Genre: Simulation

Theme: —

Archived

CnC Remastered Collection

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

Halted

Doom

Clone of Doom

id Software's original 1997 DOOM source code, released under GPL v2, powering the classic demon-hunting FPS on the UAC's Mars facility.

Platforms:LinuxDOS

Stars19,552

Updated2 years ago

LicenseGPL-2.0

Release2012

Genre: FPS

Theme: Sci-Fi

Active

osu!

Clone of Beatmania IIDX

The open-source "lazer" client of the free-to-win rhythm game osu!, built on .NET for desktop and mobile platforms.

Platforms:WindowsLinuxOSX

Stars19,061

Updated1 month ago

LicenseMIT

Release2014

Genre: Rhythm

Theme: —

* Unverified license (our read or source dataset) — check the repository itself.

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2009Action

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Doom

1993FPS

The 1993 shooter that defined the genre and sparked a modding culture still alive today — its source release made it one of gaming's most-cloned engines.

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Quake

1996FPS

id Software's fully-3D follow-up to Doom — its GPL-released source (QuakeC included) made it one of the most forked engines in open-source gaming.

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Super Mario

1985Platform

The NES platformer that made side-scrolling mainstream — open-source engines recreate its physics and level format down to the pixel.

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Legend of Zelda - A Link to the Past

1991Action

The SNES classic that set the template for top-down action-adventure — its engine and tile format have been reverse-engineered many times over.

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Diablo II

2000RPG

Blizzard North's dungeon-crawler that defined the ARPG genre — reverse-engineered projects like OpenDiablo2 rebuild it from the original assets up.

6 clones to play

Grand Theft Auto III

2001Action

The open-world franchise everyone's talking about again — its early file formats and engines have been reverse-engineered for years, well before GTA 6 hype.

4 clones to play

StarCraft

1998Real-Time Strategy

Blizzard's 1998 real-time strategy game that helped build esports as we know it — open-source engines keep its campaign and balance playable today.

5 clones to play

Sonic the Hedgehog

1991Platform

Sega's answer to Mario — its physics and level format have been painstakingly reverse-engineered by fan projects for decades.

8 clones to play