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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Quadrilateral Cowboy

Clone of Quadrilateral Cowboy

Blendo Games' official GPL source release for Quadrilateral Cowboy, a first-person cyberpunk hacking adventure built on idTech4.

Platforms:Windows

Stars331

Updated1 month ago

LicenseGPL-3.0

Release2020

Genre: Adventure

Theme: Cyberpunk

Archived

No preview

Duke Nukem 3D

Clone of Duke Nukem 3D

3D Realms' official GPL-licensed source code release of Duke Nukem 3D v1.5 (CD version), dated April 1, 2003, without the game's data files.

Platforms:WindowsDOS

Stars330

Updated13 years ago

LicenseUnknown

Release2013

Genre: FPS

Theme: —

Active

BZFlag

Clone of Battle Zone

BZFlag is an open-source multiplayer game combining Battle Zone-style tank combat with capture-the-flag, originally built for SGI Irix.

Platforms:WindowsLinuxOSX

Stars328

Updated18 days ago

LicenseUnknown

Release2015

Genre: FPS

Theme: —

Active

No preview

Pokémon TCG

Clone of Pokémon Trading Card Game

A disassembly rebuilding the original Pokémon Trading Card Game Game Boy Color ROM from source.

Platforms:Game Boy

Stars328

Updated1 month ago

LicenseUnknown

Release2014

Genre: Card Game

Theme: —

Active

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Woof!

Clone of Doom

A modern continuation of Lee Killough's MBF Doom source port, adding widescreen rendering, uncapped framerate, and gamepad support.

Platforms:WindowsLinux

Stars326

Updated11 days ago

LicenseGPL-2.0

Release2016

Genre: FPS

Theme: Sci-Fi

Halted

Blitzkrieg

Clone of Blitzkrieg

The official 2025 release of Blitzkrieg's singleplayer source code by Nival, under a non-commercial license, needing third-party SDKs.

Platforms:Windows

Stars325

Updated1 year ago

LicenseUnknown

Release2025

Genre: Real-Time Tactics

Theme: World War II

Active

Open Imperium Galactica

Clone of Imperium Galactica

A Java reimplementation of the 4X space strategy game Imperium Galactica, bundling its data with Digital Reality's permission.

Platforms:WindowsLinuxOSX

Stars325

Updated1 month ago

LicenseLGPL-3.0

Release2015

Genre: Strategy

Theme: Sci-Fi

Halted

Project Porcupine

Clone of Dwarf Fortress

A Unity tutorial project and base-building game skeleton inspired by Dwarf Fortress and RimWorld.

Platforms:WindowsLinuxOSX

Stars325

Updated1 year ago

LicenseGPL-3.0

Release2017

Genre: Strategy

Theme: Fantasy

Active

UnderworldGodot

Clone of Ultima Underworld

A pre-alpha Godot Engine recreation of Ultima Underworld 1 and 2, succeeding the author's earlier Unity-based UnderworldExporter project.

Platforms:Windows

Stars323

Updated11 days ago

LicenseMIT

Release2023

Genre: RPG

Theme: Fantasy

Active

CCCP

Clone of Cortex Command

CCCP is a community-driven continuation of Cortex Command's development, free and open source under AGPLv3, with an active mod portal.

Platforms:WindowsLinuxOSX

Stars322

Updated1 month ago

LicenseAGPL-3.0

Release2024

Genre: Action

Theme: Sci-Fi

Sporadic

FreeHL

Clone of Half-Life

A QuakeC reimplementation of Half-Life via the Nuclide SDK on the FTE Engine, semi-playable across Windows, macOS, and Linux.

Platforms:WindowsLinuxOSX

Stars320

Updated10 months ago

LicenseISC

Release2021

Genre: FPS

Theme: Sci-Fi

Active

FreeSims

Clone of The Sims

An open-source engine recreation of The Sims 1 with expanded gameplay, requiring the original game's files to run.

Platforms:WindowsLinux

Stars319

Updated20 days ago

LicenseUnknown

Release2015

Genre: Simulation

Theme: Management

Active

Omnispeak

Clone of Commander Keen Series

A pixel-perfect, bug-for-bug reimplementation of Commander Keen episodes 4-6 that reads the original game's data files.

Platforms:WindowsLinux

Stars317

Updated2 months ago

LicenseGPL-2.0

Release2012

Genre: Platform

Theme: —

Active

Curvytron

Clone of Achtung, die Kurve!

A web-based multiplayer Tron-style game built around curved light-trails instead of straight lines.

Platforms:Web

Stars315

Updated2 months ago

LicenseMIT

Release2014

Genre: Arcade

Theme: —

Halted

EnTT Pacman

Clone of Pac-Man

A Pac-Man clone built as a tutorial example for the EnTT entity-component-system framework, using SDL2 and CMake.

Platforms:WindowsLinuxOSX

Stars313

Updated2 years ago

LicenseMIT

Release2018

Genre: Arcade

Theme: —

Sporadic

Blitzkrieg 2

Clone of Blitzkrieg 2

Nival's official 2025 source release of Blitzkrieg 2's C++ engine and assets, under a non-commercial community license.

Platforms:Windows

Stars311

Updated1 year ago

LicenseUnknown

Release2025

Genre: Real-Time Tactics

Theme: World War II

Active

No preview

Metroid Prime

Clone of Metroid Prime

A work-in-progress decompilation of the GameCube Metroid Prime, built from your own copy of the game.

Platforms:GameCube

Stars311

Updated11 days ago

LicenseUnknown

Release2022

Genre: FPS

Theme: —

Active

CroftEngine

Clone of Tomb Raider

An actively developed open-source engine remake of Tomb Raider 1, requiring original game data, for Windows and Linux.

Platforms:WindowsLinux

Stars310

Updated3 months ago

LicenseUnknown

Release2015

Genre: Platform

Theme: —

Active

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s2disasm

Clone of Sonic 2

A full disassembly of the original 1992 Sonic 2 Genesis code, built from source for educational, non-commercial use only.

Platforms:Genesis

Stars309

Updated18 days ago

LicenseUnknown

Release2013

Genre: Platform

Theme: —

Active

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pokeemerald-wasm

Clone of Pokémon Ruby and Sapphire

A WebAssembly recompilation of the pokeemerald decompilation, letting Pokémon Emerald run in any browser.

Platforms:Web

Stars308

Updated1 month ago

LicenseUnknown

Release2026

Genre: RPG

Theme: Fantasy

Active

No preview

Open Adventure

Clone of Colossal Cave Adventure

A forward-port of Crowther and Woods' 1995 Adventure 2.5, the last Colossal Cave version by its original authors.

Platforms:Linux

Stars305

Updated2 months ago

Licensebsd-2-clause

Release2017

Genre: Adventure

Theme: —

Sporadic

Doomsday Engine

Clone of Doom

A portable, enhanced source port supporting Doom I/II, Heretic, and Hexen, built as cross-platform C++ libraries.

Platforms:WindowsLinuxOSX

Stars303

Updated3 months ago

LicenseUnknown

Release2011

Genre: FPS

Theme: Sci-Fi

Sporadic

No preview

Scuffed Minecraft

Clone of Minecraft

A self-described "very scuffed" Minecraft clone, built as a learning project and companion to a YouTube series.

Platforms:WindowsLinux

Stars303

Updated9 months ago

LicenseMIT

Release2024

Genre: Action

Theme: Fantasy

Sporadic

OpenSupaplex

Clone of Supaplex

A 1:1 C/SDL reimplementation of Supaplex that runs on PC, Mac, Linux and many consoles, from PSP to Switch.

Platforms:WindowsLinuxOSX

Stars301

Updated6 months ago

LicenseUnknown

Release2020

Genre: Puzzle

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.

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