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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OpenNFS

Clone of Need For Speed III: Hot Pursuit

An early-stage engine recreating classic Need for Speed games 1-5 from their original data files.

Platforms:WindowsLinuxOSX

Stars834

Updated4 months ago

LicenseMIT

Release2015

Genre: Racing

Theme: —

Active

Zero-K

Clone of Supreme Commander

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

Sporadic

DelverEngine

Clone of Delver

This is the official open-source release of the Delver engine and level editor, built in Java on libGDX, licensed under zlib.

Platforms:WindowsLinuxOSX

Stars824

Updated1 year ago

LicenseZlib

Release2018

Genre: RPG

Theme: —

Active

Original game image

LibreQuake

Clone of Quake

LibreQuake is free, GPL-compatible replacement game data for Quake, requiring a separate compatible engine such as vkQuake to run.

Platforms:WindowsLinuxOSX

Stars823

Updated2 months ago

LicenseUnknown

Release2019

Genre: FPS

Theme: Fantasy

Active

minesweeper-rs

Clone of Minesweeper

A Rust port of a Windows Minesweeper sample, built on Microsoft's windows-rs bindings.

Platforms:None

Stars819

Updated2 months ago

LicenseMIT

Release2020

Genre: Puzzle

Theme: —

Active

Aleph One

Clone of Marathon

Aleph One is the open-source, GPLv3 continuation of Bungie's Marathon engines, playing Marathon, Marathon 2, and Marathon Infinity.

Platforms:WindowsLinuxOSX

Stars812

Updated1 month ago

LicenseGPL-3.0

Release2015

Genre: FPS

Theme: Sci-Fi

Halted

Tiny Wings

Clone of Tiny Wings

A work-in-progress recreation of key features from the 2011 iOS hit Tiny Wings, built with Cocos2D.

Platforms:OSX

Stars812

Updated4 years ago

LicenseMIT

Release2011

Genre: Arcade

Theme: —

Sporadic

OpenMoHAA

Clone of Medal of Honor: Allied Assault

An open-source engine for Medal of Honor: Allied Assault and its expansions, adding bots and modern-system support.

Platforms:WindowsLinuxOSX

Stars807

Updated6 months ago

LicenseGPL-2.0

Release2015

Genre: FPS

Theme: —

Halted

Command & Conquer (original game, not this project)

Original game image

Command & Conquer - HTML5

Clone 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

Sonic Mania (original game, not this project)

Original game image

Sonic Mania Decompilation

Clone of Sonic Mania

A decompilation of Sonic Mania (Plus) on RSDKv5 with a built-in mod loader; needs assets from an official release.

Stars806

Updated1 month ago

LicenseUnknown

Release2020

Genre: Platform

Theme: —

Active

Original game image

NBlood

Clone of Blood

Reverse-engineered EDuke32-based ports of Blood, PowerSlave/Exhumed, Duke Nukem 3D and other Build engine games.

Platforms:Windows

Stars803

Updated1 month ago

LicenseUnknown

Release2019

Genre: FPS

Theme: —

Halted

uMario

Clone of Super Mario

A C++/SDL2 clone of Super Mario Bros., built by developer Łukasz Jakowski as his first C++ project.

Platforms:Windows

Stars803

Updated4 years ago

LicenseGPL-2.0

Release2015

Genre: Platform

Theme: —

Active

Super Mario 64 Port

Clone of Super Mario 64

It does not include any copyrighted assets, so you must provide a supported US or JP ROM.

Stars800

Updated2 months ago

LicenseMIT

Release2023

Genre: Platform

Theme: —

Active

GoldenEye 007 (original game, not this project)

Original game image

Goldeneye 007 Decompilation

Clone of GoldenEye 007

A work-in-progress decompilation of Goldeneye 007 that builds three ROMs and needs a prior copy of the game for assets.

Stars796

Updated2 months ago

LicenseUnknown

Release2020

Genre: FPS

Theme: —

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No preview

Metal Gear Solid Integral Decompilation

A decompilation of Metal Gear Solid Integral for PlayStation; main executables are done, overlays in progress.

Stars795

Updated1 month ago

LicenseUnknown

Release2019

Genre: —

Theme: —

Halted

opsu!

Clone of Osu! Tatakae! Ouendan

An unofficial open-source Java client for the rhythm game osu!, for Windows, macOS, Linux and Android.

Platforms:WindowsLinuxOSX

Stars794

Updated3 years ago

LicenseGPL-3.0

Release2014

Genre: Rhythm

Theme: —

Active

Original game image

Sonic-Mania-Decompilation

Clone of Sonic Mania

A decompilation of Sonic Mania requiring official game assets, adding a built-in mod loader and support for building past releases.

Platforms:WindowsXbox OnePS4

Stars792

Updated1 month ago

LicenseUnknown

Release2020

Genre: Platform

Theme: —

Active

Space Nerds In Space

Clone of Artemis: Spaceship Bridge Simulator

An open-source, Artemis-inspired multiplayer spaceship bridge simulator for Linux with Lua-scripted missions.

Platforms:Linux

Stars780

Updated2 months ago

LicenseGPL-2.0

Release2012

Genre: Simulation

Theme: Sci-Fi

Halted

SuperMarioBros-C

Clone of Super Mario

A C++ decompilation of the original Super Mario Bros. NES disassembly, requiring the original ROM's graphics data to run.

Platforms:None

Stars778

Updated3 years ago

LicenseUnknown

Release2014

Genre: Platform

Theme: —

Active

Minecraft (original game, not this project)

Original game image

Modern Warfare 2, Skate 3 and Minecraft Merge

Clone of Minecraft

Modern Warfare 2, Skate 3 and Minecraft in one Rust game, built on the IW4L engine; needs your own copy of MW2.

Stars776

Updated1 month ago

LicenseApache-2.0

Release2026

Genre: Action

Theme: Fantasy

Halted

Mari0

Clone of Mario World

Mari0 is a remake built on the LÖVE 11.4 framework, released under the MIT license.

Platforms:WindowsLinuxOSX

Stars774

Updated3 years ago

LicenseUnknown

Release2012

Genre: Platform

Theme: —

Active

Call of Duty: Modern Warfare 2 Engine Reimplementation

Clone of Call of Duty: Modern Warfare 2

A Rust and Bevy engine that runs Call of Duty: Modern Warfare 2 from your own game files; gameplay is still incomplete.

Stars773

Updated1 month ago

LicenseApache-2.0

Release2026

Genre: FPS

Theme: —

Active

DOOM Retro

Clone of Doom

DOOM Retro is a Windows Doom source port by Brad Harding since 2013, aiming for a dark, gritty, pixelated take on the classic game.

Platforms:Windows

Stars771

Updated1 month ago

LicenseGPL-3.0

Release2013

Genre: FPS

Theme: Sci-Fi

Active

Jedi Knight: Dark Forces II Engine Reimplementation

Clone of Star Wars Jedi Knight: Dark Forces II

A function-by-function C reimplementation of Jedi Knight: Dark Forces II for Windows, macOS, Linux and more.

Stars760

Updated1 month ago

LicenseUnknown

Release2018

Genre: Fighting

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