Free & Open Source Clones & Remakes of Retro Games

3,241 open-source clones and remakes of 1,919 retro games — real source code you can read, fork, and play today, not just a free download.

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Sporadic

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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

Updated10 months ago

LicenseMIT

Release2019

Genre: Adventure

Theme: —

Halted

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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

Updated26 days ago

LicenseApache-2.0

Release2022

Genre: Action

Theme: Martial Arts

Active

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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

Updated2 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

Updated11 days 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

Updated10 months 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

Updated11 days 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

Updated13 days 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

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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

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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

Updated29 days ago

LicenseUnknown

Release2012

Genre: RPG

Theme: —

Archived

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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

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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

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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

Updated18 days ago

LicenseGPL-2.0

Release2009

Genre: FPS

Theme: Sci-Fi

Active

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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

Updated12 days 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

Updated8 days 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

Updated12 days ago

LicenseMIT

Release2012

Genre: Card Game

Theme: Fantasy

Active

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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

Updated18 days 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

Updated13 days 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

Updated11 days ago

LicenseMIT

Release2026

Genre: MMORPG

Theme: Fantasy

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

Stars2,246

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

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UZDoom

Clone of Doom

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

Platforms:WindowsLinuxOSX

Stars2,218

Updated12 days ago

LicenseUnknown

Release2025

Genre: FPS

Theme: Sci-Fi

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.

41 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.

17 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

1998Action

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.

3 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.

4 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.

7 clones to play