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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Pokemon Red Recompilation

Clone of Pokémon Red, Blue, and Yellow

A native LOVE2D recreation of eleven Pokemon games that decodes its data from a ROM you supply.

Stars3,835

Updated1 month ago

LicenseUnknown

Release2026

Genre: RPG

Theme: Fantasy

Active

Space Station 14

Clone of Space Station 13

An open-source remake of SS13 built on a custom C# engine, with heavily moddable community servers.

Platforms:WindowsLinuxOSX

Stars3,798

Updated1 month ago

LicenseMIT

Release2017

Genre: RPG

Theme: Sci-Fi

Halted

PythonPlantsVsZombies

Clone of Plants vs. Zombies

PythonPlantsVsZombies is a Python and Pygame recreation of Plants vs. Zombies with a subset of its plants and zombies.

Platforms:None

Stars3,764

Updated2 years ago

LicenseUnknown

Release2019

Genre: Strategy

Theme: —

Active

Thrive

Clone of Spore

An open-source evolution sim where you guide a species from a single cell through mutation-driven natural selection.

Platforms:Windows

Stars3,706

Updated1 month ago

LicenseUnknown

Release2012

Genre: Simulation

Theme: Sci-Fi

Halted

Original game image

Amnesia: The Dark Descent

Clone of Amnesia: The Dark Descent

The official GPL-licensed engine source for Amnesia: The Dark Descent, which won't compile out of the box without the discontinued FBX SDK.

Platforms:WindowsLinuxOSX

Stars3,678

Updated6 years ago

LicenseGPL-3.0

Release2020

Genre: Adventure

Theme: Horror

Active

Cubyz

Clone of Minecraft

Cubyz is a Minecraft-inspired 3D voxel sandbox written in Zig, with unlimited-height chunking and procedural tool crafting.

Platforms:WindowsLinux

Stars3,661

Updated1 month ago

LicenseGPL-3.0

Release2019

Genre: Action

Theme: Fantasy

Active

OpenXRay

Clone of S.T.A.L.K.E.R.

A community-improved X-Ray Engine for S.T.A.L.K.E.R. with 64-bit support, bug fixes and Linux/macOS ports.

Platforms:Windows

Stars3,559

Updated1 month ago

LicenseUnknown

Release2014

Genre: FPS

Theme: Alternate Historical

Active

OpenGOAL

Clone of Jak and Daxter: The Precursor Legacy

A native PC port of the Jak and Daxter trilogy, decompiled from the original GOAL code; requires your own PS2 discs.

Platforms:WindowsLinuxOSX

Stars3,510

Updated1 month ago

LicenseISC

Release2020

Genre: Platform

Theme: Fantasy

Active

Daggerfall Unity

Clone of The Elder Scrolls II: Daggerfall

Daggerfall Unity recreates Daggerfall natively in Unity with hundreds of bug fixes, widescreen rendering, and extensive mod support.

Platforms:WindowsLinuxOSX

Stars3,496

Updated1 month ago

LicenseMIT

Release2015

Genre: RPG

Theme: —

Active

fheroes2

Clone of Heroes of Might and Magic II

fheroes2 is an open-source, from-scratch recreation of the Heroes of Might and Magic II engine, with high-resolution graphics and better AI.

Platforms:WindowsLinuxOSX

Stars3,479

Updated1 month ago

LicenseGPL-2.0

Release2019

Genre: Turn-Based Strategy

Theme: —

Active

Pokémon Ruby and Sapphire (original game, not this project)

Original game image

Pokémon Emerald

Clone of Pokémon Ruby and Sapphire

A decompilation of Pokémon Emerald that rebuilds a byte-matching GBA ROM from reconstructed source code.

Platforms:GBA

Stars3,469

Updated2 months ago

LicenseUnknown

Release2015

Genre: RPG

Theme: Fantasy

Active

Lego Island (original game, not this project)

Original game image

LEGO Island Decompilation

Clone of Lego Island

A complete decompilation of LEGO Island 1.1, reproducing its original binaries byte-for-byte as a base for modification, not end users.

Platforms:Windows

Stars3,467

Updated2 months ago

LicenseLGPL-3.0

Release2023

Genre: Action-Adventure

Theme: —

Active

Julius

Clone of Caesar III

Julius is an open-source reimplementation of Caesar III reproducing the original's logic and save compatibility, with widescreen support.

Platforms:WebWindowsLinux

Stars3,375

Updated1 month ago

LicenseAGPL-3.0

Release2017

Genre: Simulation

Theme: Management

Halted

Original game image

Quake 2

Clone of Quake 2

id Software's official GPL source release for Quake II (v3.19), built and tested with Visual C++ 6.0.

Platforms:WindowsLinux

Stars3,343

Updated2 years ago

LicenseUnknown

Release2012

Genre: FPS

Theme: Sci-Fi

Active

No preview

PS2Recomp - Playstation 2 Static Recompiler & Runtime Tool to make native PC Ports

An experimental static recompiler that turns PlayStation 2 ELF binaries into C++ and supplies a runtime to run them.

Stars3,327

Updated1 month ago

LicenseGPL-3.0

Release2025

Genre: —

Theme: —

Halted

Serious Engine

Clone of Serious Sam: The First Encounter

Croteam's official open-source release of Serious Engine 1.10, the toolchain behind the original Serious Sam Classic games.

Platforms:Windows

Stars3,179

Updated6 years ago

LicenseGPL-2.0

Release2016

Genre: FPS

Theme: —

Active

sandspiel

Clone of Powder Game

A browser-playable falling-sand simulation in Rust/WebAssembly and WebGL, letting players create, share, and fork creations.

Platforms:Web

Stars3,168

Updated2 months ago

LicenseMIT

Release2018

Genre: Simulation

Theme: —

Sporadic

Pokete

Clone of Pokémon

A terminal-based Python creature-battling game styled after Pokémon, with its own creatures, types, and trainer battles.

Platforms:WindowsLinuxOSX

Stars3,156

Updated5 months ago

LicenseGPL-3.0

Release2021

Genre: RPG

Theme: —

Active

SuperTux

Clone of SuperTux

An open-source Super Mario Bros.-inspired platformer starring Tux the penguin, rescuing Penny from the villain Nolok.

Platforms:WebWindowsLinux

Stars3,144

Updated1 month ago

LicenseGPL-3.0

Release2013

Genre: platformer

Theme: —

Active

Super Mario Bros. (original game, not this project)

Original game image

Super Mario Bros Remastered

Clone of Super Mario Bros.

An open-source, Godot-built recreation of the classic Super Mario Bros. games with a full level editor and custom characters.

Platforms:WindowsLinux

Stars3,142

Updated2 months ago

LicenseGPL-3.0

Release2025

Genre: Action

Theme: —

Active

Original game image

GZDoom

Clone of Doom

GZDoom is a modder-friendly source port of the Doom engine covering Doom, Heretic, and Hexen, with OpenGL and Vulkan rendering support.

Platforms:WindowsLinux

Stars3,102

Updated3 months ago

LicenseGPL-3.0

Release2013

Genre: FPS

Theme: Sci-Fi

Active

Widelands

Clone of The Settlers II

Widelands is a free, open-source RTS inspired by The Settlers II, with singleplayer campaigns, multiplayer, and Lua-scripted scenarios.

Platforms:WindowsLinuxOSX

Stars3,061

Updated1 month ago

LicenseGPL-2.0

Release2019

Genre: Real-Time Strategy

Theme: Medieval

Sporadic

Original game image

Descent 3

Clone of Descent 3

The official open-source release of the Descent 3 engine under GPL-3.0, running on Windows, Linux, macOS, and Android.

Platforms:WindowsLinuxOSX

Stars3,006

Updated9 months ago

LicenseGPL-3.0

Release2024

Genre: FPS

Theme: Sci-Fi

Archived

Original game image

Space Engineers

Clone of Space Engineers

Keen Software House's archived release of Space Engineers' official source code, requiring an owned Steam copy of the game to build.

Platforms:Windows

Stars2,980

Updated4 years ago

LicenseUnknown

Release2015

Genre: Simulation

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