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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Active

Dagor Engine

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

Active

wipEout Rewrite

Clone of Wipeout

A work-in-progress, asset-free re-implementation of the 1995 PSX racer Wipeout for SDL2, Sokol, and web.

Platforms:WebWindowsLinux

Stars2,962

Updated3 months ago

LicenseUnknown

Release2023

Genre: Racing

Theme: Sci-Fi

Active

kys-cpp

Clone of Heroes of Jin Yong

kys-cpp is a C++ remake of the 1996 wuxia RPG Heroes of Jin Yong, adding real-time combat modes inspired by Hades and Sekiro.

Platforms:WindowsLinux

Stars2,961

Updated2 months ago

LicenseBSD-3-Clause

Release2016

Genre: RPG

Theme: Fantasy

Sporadic

Original game image

Zork I Source Code Collection

Clone of Zork

The original 1980 ZIL source code for Infocom's Zork I, preserved as an anonymously contributed development snapshot.

Platforms:None

Stars2,951

Updated11 months ago

LicenseMIT

Release2019

Genre: Adventure

Theme: —

Halted

Fallout (original game, not this project)

Original game image

Fallout Community Edition

Clone of Fallout

Fallout Community Edition reimplements the original Fallout's engine with bugfixes and QoL improvements, as a drop-in Windows replacement.

Platforms:WindowsLinuxOSX

Stars2,915

Updated1 year ago

LicenseUnknown

Release2023

Genre: RPG

Theme: Post-Apocalyptic

Active

Overgrowth

Clone of Overgrowth

The official Apache-2.0 source code for Wolfire Games' Overgrowth; the game data still has to be bought separately.

Platforms:WindowsLinuxOSX

Stars2,903

Updated2 months ago

LicenseApache-2.0

Release2022

Genre: Action

Theme: Martial Arts

Active

ioquake3

Clone of Quake 3

ioquake3 is an actively maintained, modernized engine for Quake III Arena and Team Arena, supporting standalone games too.

Platforms:WindowsLinuxOSX

Stars2,821

Updated3 months ago

LicenseGPL-2.0

Release2012

Genre: FPS

Theme: Sci-Fi

Active

ScummVM

Clone of SCUMM

An open-source engine reimplementation that lets classic point-and-click adventures and RPGs run on modern platforms.

Platforms:WindowsLinuxOSX

Stars2,811

Updated1 month ago

LicenseGPL-3.0

Release2011

Genre: Adventure

Theme: —

Sporadic

MineCraft-One-Week-Challenge

Clone of Minecraft

A C++/OpenGL Minecraft clone built in one week for a YouTube challenge, with day-by-day progress logged.

Platforms:WindowsLinux

Stars2,748

Updated1 year ago

LicenseUnknown

Release2017

Genre: Action

Theme: Fantasy

Active

Forge

Clone of Magic: The Gathering

Forge is an open-source rules engine for Magic: The Gathering with Adventure mode and AI-opponent Draft, Commander, and Cube formats.

Platforms:WindowsLinuxOSX

Stars2,698

Updated1 month ago

LicenseGPL-3.0

Release2022

Genre: Card Game

Theme: Fantasy

Active

Phira

Clone of Phigros

An open-source rhythm game modeled on Phigros, with builds for Android, Windows, Linux and iOS.

Platforms:WindowsLinux

Stars2,661

Updated1 month ago

LicenseGPL-3.0

Release2023

Genre: Puzzle

Theme: Anime

Halted

SanAndreasUnity

Clone of Grand Theft Auto: San Andreas

An open-source Unity reimplementation of GTA San Andreas with full multiplayer and Android support, using your own game files.

Platforms:WindowsLinuxAndroid

Stars2,626

Updated3 years ago

LicenseMIT

Release2018

Genre: Action

Theme: Crime

Halted

Spear of Destiny (original game, not this project)

Original game image

Wolfenstein 3D

Clone of Spear of Destiny

id Software's official 1992 GPL source release for Wolfenstein 3D's DOS engine, including John Carmack's own retrospective notes.

Platforms:DOS

Stars2,540

Updated14 years ago

LicenseUnknown

Release2012

Genre: FPS

Theme: —

Active

Pokémon Gold and Silver (original game, not this project)

Original game image

Pokémon Crystal

Clone of Pokémon Gold and Silver

A byte-accurate disassembly of Pokémon Crystal, rebuilding several known ROM revisions from source.

Platforms:Game Boy

Stars2,500

Updated2 months ago

LicenseUnknown

Release2012

Genre: RPG

Theme: —

Archived

Minecraft (original game, not this project)

Original game image

TrueCraft

Clone of Minecraft

A clean-room, non-decompiled implementation of Minecraft beta 1.7.3, preserving the game before later additions.

Platforms:Windows

Stars2,457

Updated7 years ago

LicenseMIT

Release2014

Genre: Action

Theme: Fantasy

Halted

Tetris (original game, not this project)

Original game image

Hextris

Clone of Tetris

A web-based puzzle game inspired by Tetris, playable directly in the browser with no installation required.

Platforms:Web

Stars2,435

Updated3 years ago

LicenseUnknown

Release2014

Genre: Puzzle

Theme: Abstract

Halted

Fallout 2 (original game, not this project)

Original game image

Fallout 2 Community Edition

Clone of Fallout 2

A from-scratch reimplementation of Fallout 2's engine with bugfixes and quality-of-life improvements, requiring the original game data.

Platforms:WindowsLinuxOSX

Stars2,425

Updated1 year ago

LicenseUnknown

Release2022

Genre: RPG

Theme: —

Active

Chocolate Doom

Clone of Doom

A source port that reproduces the original DOS Doom, Heretic, Hexen, and Strife with their original bugs intact on modern systems.

Platforms:WindowsLinuxOSX

Stars2,416

Updated2 months ago

LicenseGPL-2.0

Release2009

Genre: FPS

Theme: Sci-Fi

Active

Original game image

Purpur

Clone of Minecraft

Purpur is a Minecraft server implementation, a drop-in replacement for Paper focused on configurability and new features.

Platforms:WindowsLinuxOSX

Stars2,409

Updated1 month ago

LicenseMIT

Release2019

Genre: Action

Theme: Fantasy

Active

Veloren

Clone of Cube World

An open-source GPLv3 action-adventure RPG inspired by Cube World, Dwarf Fortress, and Minecraft.

Platforms:WindowsLinuxOSX

Stars2,391

Updated1 month ago

Licensegpl-3.0+

Release2019

Genre: RPG

Theme: —

Active

XMage

Clone of Magic: The Gathering Online

An open-source Magic: The Gathering rules engine supporting 32,000+ cards, drafts, and online multiplayer.

Platforms:WindowsLinuxOSX

Stars2,359

Updated1 month ago

LicenseMIT

Release2012

Genre: Card Game

Theme: Fantasy

Active

Mario Kart 64 (original game, not this project)

Original game image

SpaghettiKart

Clone of Mario Kart 64

A no-assets-included PC/Switch port of Mario Kart 64, built on the libultraship framework with mod support.

Platforms:WindowsLinuxOSX

Stars2,348

Updated2 months ago

LicenseUnknown

Release2024

Genre: Racing

Theme: —

Active

vkQuake

Clone of Quake

A Vulkan-powered Quake port with better performance, modern rendering features, and support for the 2021 re-release.

Platforms:WindowsLinuxOSX

Stars2,279

Updated1 month ago

LicenseGPL-2.0

Release2016

Genre: FPS

Theme: Fantasy

Active

World of ClaudeCraft

Clone of World of Warcraft

World of ClaudeCraft is an open-source, self-hostable browser MMORPG inspired by World of Warcraft, with nine classes and dungeons.

Platforms:Web

Stars2,254

Updated1 month ago

LicenseMIT

Release2026

Genre: MMORPG

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