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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Halted

2048.cpp

Clone of 2048

A terminal reimplementation of 2048 in C++11 with vim-style controls, save/resume, and score tracking, buildable via CMake or Meson.

Platforms:LinuxOSX

Stars2,247

Updated2 years ago

LicenseMIT

Release2018

Genre: Puzzle

Theme: —

Halted

OpenRW "Open ReWrite"

Clone of Grand Theft Auto III

A partial open-source re-implementation of Grand Theft Auto III for Linux, macOS, Windows and BSD; needs the original PC game.

Platforms:WindowsLinuxOSX

Stars2,222

Updated1 year ago

LicenseGPL-3.0

Release2015

Genre: Action

Theme: Crime

Active

Original game image

UZDoom

Clone of Doom

A modern GPLv3 source port continuing the ZDoom/GZDoom lineage for Doom, Heretic, and Hexen.

Platforms:WindowsLinuxOSX

Stars2,218

Updated1 month ago

LicenseUnknown

Release2025

Genre: FPS

Theme: Sci-Fi

Sporadic

OpenXcom

Clone of X-COM: Terror from the Deep

A playable open-source clone of UFO: Enemy Unknown and Terror from the Deep with extensive mod support.

Platforms:WindowsLinuxOSX

Stars2,215

Updated5 months ago

LicenseGPL-3.0

Release2011

Genre: Strategy

Theme: Horror

Halted

Quake 2 (original game, not this project)

Original game image

Quake II Rerelease

Clone of Quake 2

id Software's official source for the 2023 Quake II Rerelease's game-logic DLL, merging all four expansion codebases into one.

Platforms:Windows

Stars2,203

Updated3 years ago

LicenseGPL-2.0

Release2023

Genre: FPS

Theme: Sci-Fi

Sporadic

Freeciv-web

Clone of Civilization II

A browser-based, turn-based empire-building strategy game built on the Freeciv C server, with 2D and 3D WebGL clients.

Platforms:Web

Stars2,199

Updated7 months ago

LicenseUnknown

Release2013

Genre: Turn-Based Strategy

Theme: —

Active

Original game image

Super Smash Bros Melee

Clone of Super Smash Bros. Melee

A matching decompilation of Super Smash Bros. Melee that rebuilds its executable from source, preserving HAL's original code names.

Platforms:GameCube

Stars2,198

Updated1 month ago

LicenseUnknown

Release2020

Genre: Fighting

Theme: —

Halted

Diablo (original game, not this project)

Original game image

freeablo

Clone of Diablo

An archived, cross-platform reimplementation of the Diablo 1 engine, needing the original game's data files to run.

Platforms:WindowsLinuxOSX

Stars2,170

Updated3 years ago

LicenseGPL-3.0

Release2013

Genre: RPG

Theme: Horror

Sporadic

dhewm3

Clone of Doom 3

A GPL-licensed Doom 3 source port for Windows, Linux, macOS, and FreeBSD using SDL and OpenAL, requiring separately supplied game data.

Platforms:WindowsLinuxOSX

Stars2,168

Updated5 months ago

LicenseGPL-3.0

Release2012

Genre: FPS

Theme: Sci-Fi

Active

SimCity (original game, not this project)

Original game image

Cytopia

Clone of SimCity

A free, open-source retro pixel-art city-builder with a custom SDL2 isometric engine in C++; core building mechanics are still planned.

Platforms:WindowsLinuxOSX

Stars2,160

Updated2 months ago

LicenseGPL-3.0

Release2018

Genre: Simulation

Theme: Management

Active

Original game image

The Legend of Zelda: Breath of the Wild

Clone of The Legend of Zelda: Breath of the Wild

An experimental, work-in-progress decompilation of Breath of the Wild for research purposes, containing no game assets and unplayable.

Platforms:Switch

Stars2,127

Updated1 month ago

LicenseUnknown

Release2020

Genre: Action

Theme: —

Active

StepMania

Clone of Dance Dance Revolution

An open-source, cross-platform rhythm game engine inspired by Dance Dance Revolution, released under the MIT license.

Platforms:WindowsLinuxOSX

Stars2,098

Updated2 months ago

LicenseUnknown

Release2013

Genre: Rhythm

Theme: —

Active

Augustus

Clone of Caesar III

A fork of the Julius Caesar III re-implementation adding new customizable gameplay, actively developed for Windows, Linux, macOS, and more.

Platforms:Web

Stars2,082

Updated1 month ago

LicenseAGPL-3.0

Release2020

Genre: Simulation

Theme: Management

Active

Star Fox 64 Port

Clone of Star Fox 64

It includes no copyrighted assets and requires you to provide a supported copy of the game.

Stars2,077

Updated1 month ago

LicenseCC0-1.0

Release2024

Genre: Shooter

Theme: Sci-Fi

Active

ClassiCube

Clone of Minecraft

A from-scratch, open-source client replicating the 2009 Minecraft Classic client, running on a very wide range of platforms.

Platforms:WebWindowsLinux

Stars2,060

Updated1 month ago

LicenseUnknown

Release2014

Genre: Action

Theme: Fantasy

Active

UndertaleModTool

Clone of Undertale

A full GUI/CLI tool for decompiling, editing, and modding Undertale, Deltarune, and other GameMaker-engine games.

Platforms:WindowsLinuxOSX

Stars2,049

Updated2 months ago

LicenseGPL-3.0

Release2018

Genre: RPG

Theme: Comedy

Active

Perfect Dark (original game, not this project)

Original game image

Perfect Dark Port

Clone of Perfect Dark

A work-in-progress port of the Perfect Dark decompilation to modern platforms.

Stars2,037

Updated3 months ago

LicenseMIT

Release2023

Genre: FPS

Theme: —

Active

The Legend of Zelda: Twilight Princess

Clone of The Legend of Zelda: Twilight Princess

A decompilation of Twilight Princess reproducing a binary identical to the original from your own disc image.

Platforms:GameCubeWii

Stars2,023

Updated4 months ago

LicenseCC0-1.0

Release2020

Genre: Action

Theme: —

Active

Athena Crisis

Clone of Athena Crisis

Athena Crisis is an MIT-licensed turn-based strategy game whose core code — engine, AI, rendering, and map editor — is open-core.

Platforms:Web

Stars1,981

Updated2 months ago

LicenseUnknown

Release2024

Genre: Turn-Based Tactics

Theme: Sci-Fi

Active

Banjo-Kazooie (original game, not this project)

Original game image

Banjo: Recompiled

Clone of Banjo-Kazooie

A native N64: Recompiled-based port of Banjo-Kazooie for Windows, Linux, and macOS, requiring your own North American ROM to load.

Platforms:WindowsLinuxOSX

Stars1,970

Updated2 months ago

LicenseGPL-3.0

Release2025

Genre: Adventure

Theme: —

Halted

Commander Keen Series (original game, not this project)

Original game image

Keen Dreams

Clone of Commander Keen Series

The official GPLv2+-licensed source release of Commander Keen in Keen Dreams, though game data must be acquired separately.

Platforms:None

Stars1,967

Updated12 years ago

LicenseGPL-2.0

Release2014

Genre: Platform

Theme: —

Active

SDLPAL

Clone of The Legend of Sword and Fairy

A cross-platform SDL reimplementation of the engine behind the 1995 Chinese RPG Legend of Sword and Fairy.

Platforms:WebLinux

Stars1,961

Updated2 months ago

LicenseGPL-3.0

Release2016

Genre: RPG

Theme: Fantasy

Halted

CSS Minecraft

Clone of Minecraft

A Minecraft clone built entirely with HTML and CSS, using no JavaScript.

Platforms:Web

Stars1,940

Updated2 years ago

LicenseUnknown

Release2022

Genre: Action

Theme: Fantasy

Sporadic

Hematite

Clone of Minecraft

A simple Minecraft-like world viewer built in Rust with the Piston engine, opening real 1.8.8-format Minecraft saves for personal use.

Platforms:None

Stars1,919

Updated6 months ago

LicenseMIT

Release2014

Genre: Action

Theme: Fantasy

People are curious about clones of...

Games you know, and the open-source projects that recreate them.

View all originals

Minecraft

2009Action

The block-building sandbox that reshaped an entire genre — open-source clones range from full Java reimplementations to engines built from scratch.

43 clones to play

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.

40 clones to play

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.

20 clones to play

Super Mario

1985Platform

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

20 clones to play

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.

20 clones to play

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