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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Darkflame Universe

Clone of Lego Universe

Darkflame Universe is an open-source LEGO Universe server emulator under active development since 2013, requiring a separate game client.

Platforms:WindowsLinuxOSX

Stars756

Updated2 months ago

LicenseAGPL-3.0

Release2021

Genre: MMORPG

Theme: —

Sporadic

NFSIISE

Clone of Need For Speed II

A cross-platform wrapper for Need for Speed II SE adding OpenGL rendering and TCP play, with Linux and Android support.

Platforms:LinuxAndroid

Stars755

Updated6 months ago

LicenseMIT

Release2014

Genre: Racing

Theme: —

Halted

Return to Castle Wolfenstein (original game, not this project)

Original game image

iortcw

Clone 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.

Platforms:WindowsLinuxOSX

Stars751

Updated2 years ago

LicenseGPL-3.0

Release2015

Genre: FPS

Theme: Sci-Fi

Active

Blue Dragon Recompilation

Clone of Blue Dragon

re:Blue is an unofficial static recompilation of Blue Dragon that runs natively on Windows, Linux and macOS.

Stars742

Updated1 month ago

LicenseBSD-3-Clause

Release2026

Genre: RPG

Theme: —

Active

Blue Dragon Recompilation

Clone of Blue Dragon

re:Blue is an unofficial static recompilation of Blue Dragon that runs natively on Windows, Linux and macOS.

Stars742

Updated1 month ago

LicenseBSD-3-Clause

Release2026

Genre: RPG

Theme: —

Active

Metaforce

Clone of Metroid Prime

An alpha-stage native reimplementation of Metroid Prime for Windows, macOS and Linux.

Platforms:WindowsLinuxOSX

Stars742

Updated2 months ago

LicenseUnknown

Release2015

Genre: FPS

Theme: —

Active

Vangers

Clone of Vangers

An open-source GPLv3 recreation of the 1998 racing-RPG Vangers, built with SDL3 and requiring some original assets.

Platforms:WindowsLinuxOSX

Stars737

Updated2 months ago

LicenseGPL-3.0

Release2014

Genre: Racing

Theme: Sci-Fi

Halted

Javascript Tetris

Clone of Tetris

A basic MIT-licensed HTML5 canvas implementation of Tetris for major browsers, with development halted before planned features were added.

Platforms:Web

Stars733

Updated1 year ago

LicenseMIT

Release2011

Genre: Puzzle

Theme: Abstract

Active

The Minish Cap Port

A Nintendo 3DS dual-screen port of The Legend of Zelda: The Minish Cap with widescreen and a touch bottom screen.

Stars733

Updated1 month ago

LicenseGPL-3.0

Release2026

Genre: —

Theme: —

Active

Unitystation

Clone of Space Station 13

A free multiplayer RPG remake of the cult-classic Space Station 13, rebuilt outside the original BYOND engine.

Platforms:WindowsLinuxOSX

Stars733

Updated1 month ago

LicenseAGPL-3.0

Release2016

Genre: RPG

Theme: Sci-Fi

Halted

Original game image

pacman

Clone of Pac-Man

Platforms:Web

Stars731

Updated3 years ago

LicenseWTFPL

Release2010

Genre: Arcade

Theme: —

Halted

micropolisJS

Clone of SimCity

A JavaScript/HTML5 port of the city simulator Micropolis that runs in the browser.

Platforms:Web

Stars725

Updated1 year ago

LicenseUnknown

Release2013

Genre: Simulation

Theme: Management

Active

ClassicUO

Clone of Ultima Online

An open-source, cross-platform C# reimplementation of the Ultima Online Classic Client, functional but still under heavy development.

Platforms:WebWindowsLinux

Stars723

Updated2 months ago

LicenseBSD-2-Clause

Release2018

Genre: MMORPG

Theme: —

Active

ET: Legacy

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

Active

Original game image

Pokémon Gold and Silver

Clone of Pokémon Gold and Silver

A disassembly of Pokémon Gold and Silver that rebuilds the original ROMs plus several debug builds.

Platforms:Game Boy

Stars712

Updated2 months ago

LicenseUnknown

Release2015

Genre: RPG

Theme: —

Sporadic

No preview

Barony

Clone of Barony

The official open-source release of Barony's source code, requiring a purchased copy since it excludes game assets.

Platforms:WindowsLinux

Stars711

Updated8 months ago

LicenseUnknown

Release2016

Genre: RPG

Theme: Fantasy

Active

FreeCol

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: —

Active

No preview

Ballistica

Clone of BombSquad

The open-source engine behind BombSquad, pairing a C++ performance core with a moddable Python layer for game logic.

Platforms:WindowsLinuxOSX

Stars708

Updated2 months ago

LicenseUnknown

Release2019

Genre: Action

Theme: —

Active

Sonic CD (original game, not this project)

Original game image

Sonic the Hedgehog CD (Mobile)

Clone of Sonic CD

A complete decompilation of Retro Engine v3 that runs Sonic CD using assets from an official release.

Stars708

Updated2 months ago

LicenseUnknown

Release2020

Genre: Platform

Theme: —

Active

HyperRogue

Clone of Deadly Rooms of Death

A GPLv2 puzzle roguelike set on the hyperbolic plane, exploring a procedurally generated non-Euclidean world of over 60 lands.

Platforms:WebWindowsLinux

Stars707

Updated1 month ago

LicenseGPL-2.0

Release2015

Genre: Puzzle

Theme: Fantasy

Active

Jazz² Resurrection

Clone of Jazz Jackrabbit 2

A from-scratch C++ reimplementation of Jazz Jackrabbit 2, requiring the original game data and running on many platforms.

Platforms:WebWindowsLinux

Stars706

Updated1 month ago

LicenseGPL-3.0

Release2022

Genre: Platform

Theme: —

Active

Original game image

RSDKv3

Clone of Sonic CD

An open-source decompilation of the Retro Engine v3 used to build Sonic CD, needing official assets.

Platforms:WindowsLinuxOSX

Stars701

Updated2 months ago

LicenseUnknown

Release2020

Genre: Platform

Theme: —

Active

Silent Hill 2 Enhanced Edition

Clone of Silent Hill 2

A large PC enhancement mod for Silent Hill 2 adding 60 FPS, improved audio, widescreen support, and dozens of bug fixes.

Platforms:Windows

Stars700

Updated1 month ago

LicenseZlib

Release2017

Genre: TPS

Theme: Horror

Active

Final Fantasy IX (original game, not this project)

Original game image

Memoria

Clone of Final Fantasy IX

A community engine rewrite for the PC Final Fantasy IX adding widescreen, 60fps+, bug fixes and a built-in mod manager.

Platforms:Windows

Stars697

Updated1 month ago

LicenseMIT

Release2016

Genre: RPG

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