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

SurrealEngine

Clone of Unreal Tournament

A reimplementation of Unreal Engine 1 aiming to run the original Unreal and Unreal Tournament using your own game files.

Platforms:WindowsLinuxOSX

Stars1,102

Updated1 month ago

LicenseUnknown

Release2020

Genre: FPS

Theme: Sci-Fi

Halted

Riiablo

Clone of Diablo II

An in-progress, from-scratch Java rebuild of Diablo II for PC and Android, requiring the original game's assets; not yet playable.

Platforms:WindowsLinuxOSX

Stars1,100

Updated1 year ago

LicenseApache-2.0

Release2015

Genre: RPG

Theme: Fantasy

Halted

Arx Libertatis

Clone of Arx Fatalis

Arx Libertatis is a cross-platform, GPLv3+ reimplementation of the Arx Fatalis engine for Linux and Windows, though development has halted.

Platforms:WindowsLinux

Stars1,094

Updated2 years ago

LicenseGPL-3.0

Release2011

Genre: RPG

Theme: —

Active

C-Dogs SDL

Clone of C-Dogs

C-Dogs SDL is an actively maintained SDL port of C-Dogs, adding 4-player co-op, deathmatch, and over 100 user campaigns.

Platforms:WindowsLinuxOSX

Stars1,084

Updated1 month ago

LicenseGPL-2.0

Release2013

Genre: Shmup

Theme: —

Active

Castlevania: Symphony of the Night (original game, not this project)

Original game image

Castlevania: Symphony of the Night Decompilation

Clone of Castlevania: Symphony of the Night

This work-in-progress decompilation aims to rebuild Symphony of the Night's source across PS1, PSP, and Saturn versions, byte-for-byte.

Platforms:PS

Stars1,080

Updated1 month ago

LicenseAGPL-3.0

Release2021

Genre: RPG

Theme: Horror

Active

Mario Kart Wii (original game, not this project)

Original game image

Mario Kart Wii Recompilation

Clone of Mario Kart Wii

A native PC port of Mario Kart Wii made with static recompilation; you supply your own PAL disc image.

Stars1,073

Updated1 month ago

LicenseGPL-3.0

Release2026

Genre: Racing

Theme: —

Active

OpenHV

Clone of Hard Vacuum

An open-content OpenRA real-time strategy game based on Daniel Cook's Hard Vacuum design, with online multiplayer and a map editor.

Platforms:WindowsLinuxOSX

Stars1,071

Updated1 month ago

LicenseGPL-3.0

Release2019

Genre: Real-Time Strategy

Theme: Sci-Fi

Active

Lego Island (original game, not this project)

Original game image

LEGO Island, portable

Clone of Lego Island

LEGO Island, portable ports the LEGO Island decompilation to SDL3 for cross-platform builds, preserving the original 1997 game faithfully.

Platforms:WebWindowsLinux

Stars1,044

Updated2 months ago

LicenseLGPL-3.0

Release2024

Genre: Action-Adventure

Theme: —

Active

Master of Orion (original game, not this project)

Original game image

FreeOrion

Clone of Master of Orion

FreeOrion is an open-source, turn-based 4X space empire game with scripting support for community-customized mechanics and content.

Platforms:WindowsLinuxOSX

Stars1,042

Updated1 month ago

LicenseUnknown

Release2015

Genre: Turn-Based Strategy

Theme: Sci-Fi

Sporadic

Tetris-SQL

Clone of Tetris

Tetris implemented entirely as a single PostgreSQL SQL query, using recursive CTEs to drive the game loop.

Platforms:None

Stars1,040

Updated1 year ago

LicenseMIT

Release2024

Genre: Puzzle

Theme: Abstract

Halted

Rigel Engine

Clone of Duke Nukem II

A reverse-engineered, feature-complete reimplementation of Duke Nukem II in modern C++, with widescreen and controller support.

Platforms:WebWindowsLinux

Stars1,004

Updated2 years ago

LicenseGPL-2.0

Release2016

Genre: Platform

Theme: Sci-Fi

Active

Original game image

Visual Pinball

Clone of Visual Pinball

The official open-source pinball editor and simulator, with 1,050+ real and 550+ original tables across many platforms.

Platforms:WindowsLinuxOSX

Stars1,004

Updated1 month ago

LicenseUnknown

Release2016

Genre: Arcade

Theme: —

Active

Quake 2 (original game, not this project)

Original game image

Yamagi Quake II

Clone of Quake 2

An enhanced, actively maintained Quake II client with widescreen, modern controller, and OpenGL 3.2 support.

Platforms:WindowsLinuxOSX

Stars1,003

Updated1 month ago

LicenseUnknown

Release2012

Genre: FPS

Theme: Sci-Fi

Active

KeeperFX

Clone of Dungeon Keeper

KeeperFX is an open-source expansion and remake of Dungeon Keeper for modern Windows, requiring the player's own original game files.

Platforms:Windows

Stars999

Updated1 month ago

LicenseGPL-2.0

Release2015

Genre: Simulation

Theme: Horror

Sporadic

Prince of Persia (JS) - princejs.com

Clone of Prince of Persia

A browser-based HTML5/JavaScript remake of the MS-DOS Prince of Persia, playable free at princejs.com.

Platforms:Web

Stars999

Updated5 months ago

LicenseUnlicense

Release2021

Genre: Platform

Theme: —

Sporadic

Original game image

Pokémon Ruby and Sapphire

Clone of Pokémon Ruby and Sapphire

A disassembly that rebuilds Pokémon Ruby and Sapphire's Game Boy Advance ROMs from source code.

Platforms:GBA

Stars987

Updated7 months ago

LicenseUnknown

Release2016

Genre: RPG

Theme: Fantasy

Active

TRX

Clone of Tomb Raider

An open-source, single-engine reimplementation of Tomb Raider I-III with restored content, photo mode, and more.

Platforms:WindowsLinuxOSX

Stars987

Updated1 month ago

LicenseGPL-3.0

Release2021

Genre: Platform

Theme: —

Active

FreeSO

Clone of The Sims Online

FreeSO is a MonoGame reimplementation of The Sims Online, now serving mainly as an engine base for other TSO servers.

Platforms:Windows

Stars976

Updated1 month ago

LicenseMPL-2.0

Release2015

Genre: Simulation

Theme: Management

Active

RA2Web React

Clone of Command & Conquer: Red Alert 2

RA2Web React is a from-scratch TypeScript/React/Three.js rebuild of Red Alert 2's engine, playable in a web browser.

Platforms:Web

Stars965

Updated2 months ago

LicenseUnknown

Release2025

Genre: Real-Time Strategy

Theme: Modern Military

Active

The Legend of Zelda: The Wind Waker

Clone of The Legend of Zelda: The Wind Waker

This is a work-in-progress decompilation of The Wind Waker for GameCube, aiming for a binary identical to the original disc.

Platforms:GameCube

Stars964

Updated1 month ago

LicenseCC0-1.0

Release2023

Genre: Action

Theme: —

Active

Crispy Doom

Clone of Doom

Crispy Doom is a limit-removing Doom source port with higher resolution, widescreen, and uncapped framerate, staying demo-compatible.

Platforms:WindowsLinuxOSX

Stars947

Updated2 months ago

LicenseGPL-2.0

Release2014

Genre: FPS

Theme: Sci-Fi

Active

World of Warcraft Engine Reimplementation

Clone of World of Warcraft

A native C++ World of Warcraft client with a Vulkan renderer supporting 1.12, 2.4.3 and 3.3.5a; you supply the game data.

Stars938

Updated1 month ago

LicenseUnknown

Release2026

Genre: MMORPG

Theme: Fantasy

Active

OpenMW

Clone of The Elder Scrolls III: Morrowind

An open-source engine for playing Morrowind and its expansions on modern systems, with its own construction set.

Platforms:WindowsLinuxOSX

Stars935

Updated1 month ago

Licensegpl-3.0+

Release2018

Genre: RPG

Theme: Fantasy

Active

SkyCraft - Play Skyrim as a Minecraft Player

A fan mod that lets you play Skyrim with Minecraft's movement, inventory, blocks and combat, using an SKSE plugin and a Fabric mod.

Stars933

Updated1 month ago

LicenseMIT

Release2026

Genre: —

Theme: —

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