Open Source Game Clones

List of remakes

Some of these games aren't exact remakes but evolution of original ones, which were eventually open sourced.

SCUMM # Adventure Compilation: ▶ScummVM (repo) Playable Very Active C++ GPL2
List of supported games is here
3D Deathchase # Racing Vehicular Combat: ▶Deathchase 3D (repo) C GPL2
Abuse # Action Platform Horror Sci-Fi: ▶Abuse (repo) Playable Halted C++ Lisp
Ace Combat: Assault Horizon # Action Simulation Flight Simulator Modern Military: ▶open-horizon (repo) Active C++ nya-engine MIT
Ace of Spades # FPS World War II: ▶Iceball (repo) Active C Lua Open GPL3 CC-BY-SA; ▶OpenSpades (repo) Active C++ GPL3
Achtung, die Kurve! # Arcade
Curve Fever
Zatacka: ▶Achtung, die Kurve! (repo) Playable Sporadic JavaScript HTML CSS GPL3; ▶Netacka (repo) Halted C; ▶Zatacka X (repo) Playable Sporadic C SDL GPL3
Has powerups and AI.
The Adventures of Robbo # Puzzle: ▶Robbo (repo) Playable Active JavaScript
Age of Empires # RTS: ▶Chariot (repo) Unplayable Active Rust SDL2 Commercial MIT
Age of Empires # RTS: ▶Chariot (repo) Unplayable Active Rust SDL2 Commercial MIT
Age of Empires II # RTS Medieval: ▶openage (repo) Semi-Playable Active C++ Python SDL Commercial GPL3
Akalabeth: World of Doom # RPG Fantasy: ▶Aklabeth (repo) C GPL2
Alien 8 # Action: ▶Alien 8 (repo) Playable Halted C
Allegiance # Action Simulation RTS Sci-Fi: ▶Free Allegiance (repo) Sporadic C
Shared source
Alone in the Dark # Action Adventure Horror Alternate Historical
Alone in the Dark 2
Jack in the Dark
Alone in the Dark 3: ▶Free in the Dark (repo) Halted C GPL
Anacreon: Reconstruction 4021 # TBS Sci-Fi Management: ▶Ard-Reil (repo) Halted C C++ Java Pascal GPL2
Another World # Adventure Platform Sci-Fi
Out of This World
Outer World (アウターワールド Autā Wārudo): ▶New RAW (repo) Halted C++ GPL; ▶rawgl (repo) Playable Active C++ GPL
Another World 2: Heart of the Alien # Adventure Platform: ▶Heart of the Alien (repo) Halted C
AquaStax # Puzzle Platform: ▶aquastax (repo) Active JavaScript
Archon: The Light and the Dark # TBS: ▶XArchon (repo) Halted C C++ GPL3
Ares # Arcade RTS: ▶Antares (repo) Playable Active C++ GPL3
Armor Alley # Arcade Real-Time Tactics Modern Military: ▶Armor Alley (repo) Active JavaScript CC-BY-NC
Artemis: Spaceship Bridge Simulator # Simulation Sci-Fi: ▶EmptyEpsilon (repo) Playable Active C++ Multiplayer GPL2
Artillery Duel # Artillery: ▶Artillery Duel (repo) Halted Python GPL3
Arx Fatalis # RPG: ▶Arx Libertatis (repo) Active C++ Commercial
Ascendancy # TBS: ▶Starlane Empire (repo) Halted C++ GPL
Asteroids # Arcade: ▶Agendaroids (repo) Halted C GPL2; ▶Maelstrom (repo) Playable Halted C SDL; ▶Sine (repo) Semi-Playable Sporadic C++ SFML MIT; ▶Vectoroids (repo) Halted C GPL2
AstroMenace # Shmup: ▶AstroMenace (repo) Active C++ GPL3
Astrosmash # Arcade: ▶Cosmosmash (repo) Sporadic C++ SDL GPL2
Asylum # Action: ▶SDL Asylum (repo) Halted C++ GPL3
Atomic Bomberman # Action: ▶Bombman (repo) Sporadic Python GPL
Atomix # Puzzle: ▶Atomiks (repo) Playable Halted C Commercial GPL; ▶GNOME Atomix (repo) Halted C GPL2; ▶KAtomic (repo) Active C++ GPL2; ▶WAtomic (repo) Halted Delphi Kylix GPL2
Awesomenauts # RPG RTS: ▶BlakedAwesomenaughts (repo) Active JavaScript PHP MIT
Babaliba # Arcade: ▶Babaliba (repo) Visual FoxPro
Baldur's Gate series # RPG
Icewind Dale series
Planescape: Torment: ▶GemRB (repo) Active C++
Ballerburg # Artillery: ▶Ballerburg SDL (repo) Active C GPL3
Balloon Fight # Arcade: ▶Balloon Fight (repo) Active DIV Games Studio MIT
Barbarian: The Ultimate Warrior # Fighting Platform Fantasy: ▶Barbarian (repo) Active QuickBASIC QB64
Bard's Tale Contruction Set # RPG: ▶Bt Builder (repo) Active C++ GPL3
Battle Chess # TBS: ▶Open BattleChess (repo) Halted C# LGPL
Battle City # Arcade: ▶TZOD (Tank Zone Of Death) (repo) Sporadic C++ Lua GPL3
Battlecity # RTS: ▶Battle City (repo) Playable Halted C++ GPL3
Bermuda Syndrome # Adventure Platform: ▶Bermuda Syndrome (repo) Playable Halted C++ Commercial
Betrayal at Krondor # RPG: ▶xBaK (repo) Playable Halted C++ SDL GPL3
The Binding of Isaac # Roguelike: ▶Witch Blast (repo) Playable Active C++ SFML Open GPL CC-BY-NC-SA
Blade Runner # Adventure: ▶bladerunner (Engine within SCUMMVM) (repo) Active C++ GPL2; ▶replicant (repo) Halted C++
Blake Stone: Planet Strike # FPS: ▶bstone (repo) Playable Active C++
Blood # FPS: ▶Blood Crossmatching (EDuke32 vanilla) (repo) Active; ▶gdxBlood (repo) Java
reverse engineered; ▶Transfusion (repo) Playable Sporadic
Bloons Tower Defense # Tower Defense: ▶BloonsTowerDefense6 (repo) Active Java
Bolo # Shmup: ▶orona (repo) Playable Halted HTML5
Bomberman # Arcade
Dynablaster: ▶Bomb Mania Reloaded (repo) Halted C++ GPL2; ▶Bombic (repo) Halted C++ GPL2; ▶Bombic2 (repo) Halted C++ GPL2; ▶I Have No Tomatoes (repo) Halted C++; ▶Mr.Boom (repo) Active C++ SDL MIT; ▶SDL Bomber (repo) Playable Halted C SDL
Boulder Dash # Arcade: ▶boulder-dash (repo) Active Java; ▶Digger (repo) Active TypeScript; ▶GDash (repo) Active C++; ▶Mining Haze (repo) Halted C GPL2; ▶Rocks n diamonds (repo) Playable Sporadic C
Bratwurst # Arcade: ▶bratwurst (repo) Halted Lisp GPL2
Bruce Lee # Action: ▶Jet Lee (repo) Active C++
Bubble Bobble # Arcade: ▶The Bub's Brothers (repo) Halted Python MIT
Bug Bomber # Arcade: ▶BitRiot (repo) Active C++ SDL Apache
BurgerTime # Platform
バーガータイム
Hamburger
ハンバーガー: ▶BurgerSpace (repo) Halted C++ GPL2
Buster Bros # Arcade
Pang
パン
Pomping World
ポンピング・ワールド: ▶Pang Zero (repo) Halted Perl GPL2
Buzz Aldrin's Race Into Space # Strategy Simulation TBS Management: ▶Race Into Space (repo) Active C++ GPL2
C-Dogs # Shmup Run and gun: ▶C-Dogs SDL (repo) Playable Active C SDL2 GPL2 CC-BY
Cadaver # Action Adventure: ▶Cadaver (repo) Halted C++ Commercial GPL2
Caesar 3 # Simulation Strategy City Building Management: ▶CaesarIA (repo) Playable Active C++ JavaScript GPL3
most of original game works, except war logic
Call to Power II # TBS: ▶Civilization: Call To Power 2 Source Project (repo) C Custom
Cannon Fodder # Action RTS Shmup: ▶Cannon Fodder (repo) Halted HTML5 MIT; ▶Open Fodder (repo) Playable Active C++ GPL3
Carmageddon # Racing: ▶OpenC1 (repo) Playable Halted C# Commercial Custom
Castle of the Winds # Roguelike: ▶Castle of the Winds in Elm (repo) Active Elm JavaScript MIT
The Castles of Dr. Creep # Arcade: ▶DrCreep (repo) Complete C++
Cataclysm # Roguelike Survival Horror: ▶Cataclysm: Dark Days Ahead (repo) Playable Active C++ Lua ncurses CC-BY-SA
Catacomb II # Action TPS Fantasy
The Catacomb: ▶CatacombSDL (repo) Playable Halted C Commercial GPL2
Cave Story # Adventure Platform Sci-Fi
Doukutsu Monogatari: ▶NXEngine (repo) Playable Sporadic C++ Free GPL3
Chip's Challenge # Puzzle: ▶Tile World Playable Sporadic C GPL2; ▶Tile World 2 (repo) Playable Halted C GPL2
ChuChu Rocket! # Puzzle Action: ▶Duck Marines (repo) Playable Active Lua CC-BY-SA CC-BY-NC-ND
Circus Atari # Arcade: ▶Circus Linux! (repo) Halted C GPL2
Civilization # TBS: ▶Civ-Remake (repo) Halted Ruby As-is; ▶CivOne (repo) Active C# Commercial CC0
Claw # Platform: ▶OpenClaw (repo) C++ SDL GPL3
Clonk # Action Platform RTS: ▶OpenClonk (repo) Active C++ ISC
Columns # Puzzle: ▶div-columns (repo) Active DIV Games Studio MIT
Command & Conquer # RTS Sci-Fi Modern Military
Command & Conquer: Red Alert
Dune 2000: ▶OpenRA (repo) Active C# Multiplayer GPL3
Commander Keen Series # Platform: ▶Commander Genius (repo) Active C++ GPL2; ▶Keen Dreams (repo) Active C GPL2; ▶Omnispeak (repo) Active C GPL2
Commando # Shmup: ▶CommandoJS (repo) Playable Halted JavaScript CoffeeScript melonJS MIT
Contra # Platform: ▶Contra_remake (repo) Halted C++ GPL2
Cookie Clicker #: ▶CookieClickerRemake (repo) Active C# As-is
Cosmic Ark # Action: ▶CosmicArk-Advanced (repo) JavaScript custom
Crazy Cars # Racing: ▶Crazy Cars (repo) QuickBASIC QB64 As-is
Creatures # Puzzle: ▶Open Creatures (repo) Halted C++ LGPL
forks present
Crystal Caves # Platform: ▶OpenCrystalCaves (repo) C++ MIT
Crystal Quest # Arcade: ▶CrystalQuest (repo) Active JavaScript HTML5 JQuery MIT
Cube 2: Sauerbraten # FPS: ▶Inexor (repo) Semi-Playable Active C++ JavaScript HTML CSS Cube 2 Engine Zlib
In addition to improving Sauerbraten one of the stated goals of the project is to remove/replace all content with unclear or non-free licenses from the game.; ▶open-cube (repo) Semi-Playable Sporadic C++ Zlib
A modification of tesseract so basically Cube 2 with better graphics and developed on github in a modern vcs.
Curse of the Azure Bonds # RPG: ▶coab (repo) Playable Sporadic C# BSD
Cytadela # FPS: ▶Cytadela (repo) Sporadic C++ GPL3
Dandy # Arcade: ▶Fight Or Perish (repo) Sporadic C GPL2
Dark Forces # RPG
Blood
Outlaws
Shadow Warrior
The Elder Scrolls II: Daggerfall: ▶XL Engine (repo) Sporadic C++
Dark Reign 2 # RTS: ▶Dark Reign 2 (repo) Halted C++
Defender # Arcade: ▶Defendguin (repo) Sporadic C GPL2
Deflektor # Puzzle: ▶Deflektor X4 Halted C; ▶Mirror Magic Playable Halted C
Descent # FPS
Descent 2: ▶D2X-XL (repo) Active C++; ▶DXX-Rebirth (repo) Active C; ▶Kathodos (repo) Halted Python Panda3D
DesertStrike: Return to the Gulf # Shmup: ▶openstrike (repo) Unplayable Sporadic C++ GPL3
Desperados: Wanted Dead or Alive # RTS: ▶OpenDeathValley (repo) Sporadic C GPL3
Destructo # Arcade
Island of Dr. Destructo
The Island of Doctor Destructo: ▶Return of Dr. Destructo (repo) Complete C++ Allegro MIT
Deuteros # RTS: ▶Deuteros X (repo) Halted C#
Diablo # RPG Action Horror Fantasy Medieval: ▶DGEngine (repo) Active C++ Zlib; ▶freeablo (repo) Playable Active C++ Python Commercial GPL3
Digger # Arcade: ▶Digger Remastered (repo) Playable Halted C GPL
Digimon World # RPG: ▶Digimon World Project Ark (repo) Active C# Unity
Dink Smallwood # RPG: ▶GNU FreeDink (repo) Sporadic C GPL3
Dodger # Arcade: ▶dodger-remake (repo) Halted C++
Dogs of War # Shmup: ▶openDOW (repo) Sporadic C GPL3
Doom # FPS
Doom II
Heretic
Hexen: ▶Chocolate Doom (repo) Active C GPL2; ▶Doom Legacy (repo) Playable Active C++; ▶DOOM-iOS (repo) Halted C++ GPL2
iOS; ▶Doomsday (repo) Active C GPL2; ▶Freedoom (repo) Sporadic Free; ▶GLHeretic (repo) C; ▶GZDoom (repo) Active C++; ▶Mocha Doom (repo) Active Java GPL3; ▶Odamex (repo) Playable Active C GPL2; ▶PrBoom+ (repo) Active C GPL2; ▶ZDoom (repo) Active C
Doom 3 # FPS: ▶AdaDoom3 (repo) Sporadic Ada; ▶dhewm3 (repo) Active C++ GPL3; ▶RBDOOM-3-BFG (repo) Active C++ GPL3
works with BFG edition only
Doom 64 # FPS: ▶Doom64EX (repo) Active C GPL2
Drugwars # Strategy TBS Crime: ▶Dope Wars (repo) Sporadic C; ▶RxWars (repo) Active JavaScript
Duck Hunt # Arcade: ▶Duck Hunter (repo) Halted Python; ▶Duck-Rehunt (repo) Halted Python GPL; ▶duckhunt (repo) Sporadic Python; ▶duckhunt (repo) Halted JavaScript
Duke Nukem # Platform: ▶Freenukum Jump'n Run (repo) Halted C GPL3
Duke Nukem 3D # FPS: ▶EDuke32 (repo) Active C
Dune 2 # RTS Sci-Fi: ▶Dune 2 - The Maker (repo) Active Java MIT; ▶Dune Dynasty (repo) Active C GPL2; ▶Dune Legacy (repo) Active C++ GPL2; ▶OpenDUNE (repo) Active C GPL2
Dungeon Keeper # Strategy RTS Horror Fantasy Comedy: ▶KeeperFX (repo) Active C
Dungeon Keeper # Simulation RTS: ▶KeeperFX (repo) Active C
Dungeon Master # RPG Action: ▶Chaos Strikes Back (repo) Halted C++; ▶DungeonMaster (repo) Active C#
DX-Ball # Arcade: ▶DXBall (repo) Active Java Gradle
Android
E.T. the Extra-Terrestrial # Arcade Adventure: ▶javascript-E.T. (repo) Sporadic JavaScript HTML5 MIT
Earth Shaker # Puzzle: ▶earth-shaker (repo) Active Unity; ▶EarthShakerDS (repo) Active C++ Commercial BSD
Nintendo DS port
Eat The Whistle # Sports Soccer: ▶Eat The Whistle (repo) Sporadic C GPL2
Echochrome # Puzzle
Mugen Kairō
無限回廊: ▶l-echo (repo) Halted C++ GPL3
Elasto Mania # Platform: ▶X-Moto (repo) Playable Active C++ GPL2
The Elder Scrolls II: Daggerfall # RPG: ▶Daggerfall Unity (repo) Playable Active Unity MIT; ▶Daggerfall.NET (repo) Halted C#; ▶opendf (repo) Unplayable Sporadic C++ GPL3
The Elder Scrolls III: Morrowind # RPG Fantasy: ▶OpenMW (repo) Playable Active C++ GPL3
The Elder Scrolls: Arena # RPG: ▶OpenTESArena (repo) Unplayable Active C++ SDL2 Commercial MIT; ▶opentesarenapp (repo) Unplayable Halted C++ Commercial
Elements # TBS: ▶OpenEtG (repo) Active JavaScript MIT
Elite # Action Simulation Flight Simulator Sci-Fi: ▶Mission ELITE: The Battle For Birera (repo) Halted C
Elite II # Action Simulation Flight Simulator Sci-Fi Espionage: ▶Frontier 1337 (repo) C
PSP port; ▶GLFrontier (repo) Halted C++
Elite III # Action Simulation Flight Simulator Sci-Fi Espionage
Frontier: First Encounters
FFE: ▶GLFFE - Nic Mod (repo) C++ Assembly SDL; ▶jffe (repo) Halted C++ SDL
Emperor of the Fading Suns # TBS: ▶Phoenix (repo) Active Java As-is
Encounter # Shmup: ▶encounter (repo) Active JavaScript WebGL
Entombed! # Adventure: ▶Entombed! (repo) Halted C
Escape from Colditz # Action Adventure: ▶Colditz Escape! (repo) Active C GPL3
Exile # Action Adventure
Exile 1988: ▶EXILE (repo) Halted Lua LÖVE Custom
Exolon # Shmup: ▶exolon (repo) Active JavaScript
Eye of the Beholder II # RPG Action: ▶Dungeon Eye (repo) Sporadic C#
F-1 Spirit # Sports Racing Motorsports: ▶F-1 Spirit (repo) C++ SDL Free GPL
F-Zero # Racing: ▶F-Zero Clone (repo) Active JavaScript CoffeeScript WebGL; ▶Racer (repo) Active C++ Python GPL3
Fade to Black # Action Adventure: ▶f2bgl Sporadic C++ SDL
Fallout 2 # RPG: ▶DarkFO Unplayable Active JavaScript Python Commercial Apache; ▶Falltergeist (repo) Unplayable Active C++ Commercial; ▶parpg (repo) Halted Python C++ GPL
Fallout 3: Van Buren # RPG: ▶Van Buren Project (repo) Halted C# Custom
Fallout Online # MMORPG: ▶fonline (repo) Active C++ GPL3
Fallout Tactics: Brotherhood of Steel # RTS: ▶FreeFT (repo) Active C++ BSD
Fantastic Journey # Shmup
Gokujō Parodius!: ▶pucpr-ld-parodius (repo) Halted Construct
Final Fantasy VIII # RPG: ▶OpenTriad Active Java
Flag Catcher # Puzzle: ▶Gift Grabber (repo) Active JavaScript BackBone.js
Flappy Bird # Arcade Platform: ▶Clumsy Bird (repo) Active MelonJS MIT; ▶CrappyBird (repo) Sporadic JavaScript MIT; ▶Hocoslamfy (repo) Halted C SDL GPL
Flashback # Adventure Platform: ▶REminiscence Sporadic SDL
Floor 13 # TBS: ▶Floor 13 (repo) Active Ruby
Flying Shark # Shmup: ▶Friking Shark (repo) Halted C++ GPL3
Football Manager # Simulation Strategy Sports Soccer Management: ▶Football Manager (repo) C GPL2
Forgotten Realms: Unlimited Adventures # RPG: ▶Dungeon Craft (repo) Playable Active GPL2
Forsaken # FPS Sci-Fi Post-Apocalyptic: ▶ProjectX (repo) Playable Halted C GPL2
Freelancer # Action Simulation TPS Sci-Fi: ▶Librelancer Active C# OpenGL MPL
FreeSpace 2 # Action Simulation Sci-Fi: ▶FreeSpace Source Code Project (repo) Active C++
Frog! # Arcade
Back To Nature: ▶back-to-nature-c64-remake (repo) Active Java
multi-platform
Frogger # Arcade: ▶Froggix (repo) Halted Python GPL2
Frogs and Flies # Arcade
Frog Bog: ▶Batrachians (repo) Halted C++ GPL2
Galaxian # Arcade: ▶galaxian (repo) Halted ActionScript
Geometry Wars # Shmup: ▶Geometry Wars Remake (repo) Halted Java GPL; ▶Grid Wars 2 (repo) Blitz BASIC
Gish # Platform Comedy: ▶freegish (repo) Active C SDL Open GPL2 CC-BY-SA
Gladiator # Action RPG: ▶Openglad (repo) Sporadic C++
Glest # RTS Medieval Fantasy: ▶Glest Advanced Engine Playable Sporadic C++; ▶MegaGlest (repo) Playable Active C C++ GPL3 CC-BY-SA
Various mods are available.
Gods # Platform: ▶Gods -Deluxe- (repo) Halted Java
GoldenEye 007 # FPS: ▶ges-code (repo) Active C++ GPL3
The Goonies # Platform: ▶The Goonies (repo) C++
Gorillas # Arcade Artillery: ▶Gorillas (repo) Sporadic Objective-C JRL
iOS
Gothic # RPG Action
Gothic II: ▶REGoth (repo) Playable Active C++ Commercial GPL3
Grand Theft Auto # Action Adventure Crime: ▶OpenGTA (repo) Halted C++ As-is
Grand Theft Auto 2 # Action Adventure Crime: ▶gta2net (repo) Halted C#
Grand Theft Auto III # Action Adventure: ▶OpenRW "Open ReWrite" (repo) Unplayable Sporadic C++ SDL GPL3
Gravity Force # Arcade: ▶Galaxy Forces V2 (repo) Active C++
The Great Giana Sisters # Platform: ▶OpenGGS (repo) Active C++ GPL2
Grim Fandango # Adventure
Escape from Monkey Island
Myst III: Exile: ▶ResidualVM Active C++
Guitar Hero # Rhythm: ▶Frets on Fire (repo) Playable Halted Python
(look for songs on the wiki); ▶Frets on Fire X (repo) Playable Active Python
Guitar Hero # Rhythm
SingStar
Dance Dance Revolution: ▶Frets on Fire (repo) Playable Halted Python
(look for songs on the wiki); ▶Frets on Fire X (repo) Playable Active Python
Hardwar # Action Simulation Flight Simulator Sci-Fi Cyberpunk: ▶Hardwar (repo) Sporadic C C++
Haunted House # Action Adventure Survival Horror: ▶HauntedHouse (repo) Complete ActionScript
Head over Heels # Platform: ▶Head over Heels 2 (repo) C++ Allegro; ▶HeadOverHeels (repo) Sporadic C++ GPL3
Heart of Darkness # Platform Adventure: ▶HODe (repo) Halted C++
Heavy Smash # Sports Handball Sci-Fi: ▶open-heavy-smash (repo) Halted C++
Heroes of Might and Magic II # TBS: ▶fheroes2 (repo) Active C++
Heroes of Might and Magic III # TBS: ▶VCMI (repo) Playable Active C++ SDL Commercial GPL2
time-based releases
Hexen II # FPS: ▶Hammer of Thyrion (repo) Active C
Highway Encounter # RTS: ▶Vorton (repo) Halted C GPL3
History Line: 1914-1918 # Strategy Turn-Based Tactics World War I: ▶Historyline (repo) Halted C# Unity
The Hobbit # Adventure: ▶hobbitgfx (repo) Active JavaScript
Homeworld # RTS: ▶Homeworld SDL (repo) Playable Halted SDL
HoverRace # Racing: ▶HoverRace (repo) Active C++ Custom
Hovertank 3D # FPS: ▶Hovertank3D (repo) Complete C Assembly GPL2
Imperialism # TBS: ▶imperialism-remake (repo) Active Python GPL3
Imperium Galactica # RTS: ▶Open Imperium Galactica (repo) Playable Sporadic Java
Interstate '76 # Action Racing Post-Apocalyptic: ▶Interstate Outlaws (repo) Halted Python GPL
Iron Seed # RTS: ▶Iron Seed (repo) Halted Pascal GPL3
Jagged Alliance 2 # RPG Strategy Turn-Based Tactics Sci-Fi Modern Military: ▶Jagged Alliance 2 - Stracciatella (repo) Playable Active C++ C PD
Jazz Jackrabbit # Platform: ▶OpenJazz (repo) Playable Sporadic C++ SDL Commercial GPL2
Jazz Jackrabbit 2 # Platform: ▶Jazz 2 Resurrection (repo) Playable Active C# Mono Multiplayer Commercial GPL3
For the moment only use OpenGL ES 3; ▶Project Carrot (repo) Semi-Playable Sporadic C++ QT5 MIT
Needs original game data
Jedi Knight II: Jedi Outcast # FPS TPS: ▶JediOutcastLinux Playable Active C++
Jedi Knight: Jedi Academy # FPS TPS: ▶JediAcademyLinux Playable Active C++; ▶OpenJK Playable Active C++
Jet-Story # Platform: ▶Jet-Story (repo) Active C++ MIT
Jetpac # Arcade: ▶Jetpac remake (repo) Complete C# XNA
Jewel Thief # Arcade: ▶jewelthief (repo) Active Java CC-BY
JezzBall # Arcade: ▶Ice Breaker (repo)
Joust # Arcade: ▶Ostrich Riders (repo) Sporadic C++ GPL3
Jump 'n Bump # Platform: ▶Jump'n'Bump Halted C GPL2
Jumpgate: The Reconstruction Initiative # MMORPG: ▶Open Jumpgate Active C++
Jumping Jack # Arcade: ▶Jumping Jack 2: Worryingly Familiar (repo) Halted C++; ▶Jumping Jack: Further Adventures (repo) Halted C++
Jumpman # Platform: ▶Jumpman (repo) Halted Assembly
Kaboom! # Arcade: ▶DonkeyInTrouble (repo) Sporadic Lua LÖVE
Ken's Labyrinth # FPS: ▶LAB3D/SDL (repo) Sporadic C
Kid Chameleon # Platform: ▶KidChameleonRemake (repo) Active C#
Knights # Arcade: ▶Knights (repo) Active C++ GPL3
Knights and Merchants # RTS: ▶KaM Remake (repo) Active Delphi
Kula World # Platform Puzzle
Roll Away
Kula Quest: ▶Cubosphere (repo) Halted C++ GPL3
Ladder # Arcade: ▶Ladder (repo) C#; ▶Ladder (repo) Java GPL2
(source inside JAR file); ▶ladder (repo) Active Go MIT
Larn # Roguelike: ▶NLarn (repo) Active C Lua GPL2
The Last Ninja # Action Adventure: ▶LastNinja (repo) Playable Sporadic C++
Legend of Zelda - A Link to the Past # Action Adventure: ▶lttp-phaser (repo) Active JavaScript WebGL Phaser MIT; ▶Solarus (repo) Active C++ Lua
Legion # Adventure: ▶legion (repo) Halted C++ Irrlict Custom
Lego Rock Raiders # RTS: ▶rock-raiders-remake (repo) Active JavaScript
Liero # Platform Shmup: ▶Gusanos (repo) Playable Halted; ▶OpenLiero (repo) Halted C++; ▶OpenLieroX (repo) Active C++
Lionheart # RPG Action: ▶Lionheart Remake (repo) Active Java GPL2
Little Big Adventure # Adventure: ▶twin-e (repo) Playable Halted C Commercial GPL
Locomotion (Amiga 1992) # Arcade Puzzle: ▶Pendomotion (repo) Active Python
Lode Runner # Arcade: ▶KGoldrunner (repo) Playable Active C++ SDL2 GPL2; ▶Lode Runner - Total Recall (repo) Active HTML5; ▶XScavenger Playable Halted C
Log!cal # Puzzle: ▶Orbium (repo) Playable Sporadic JavaScript HTML5 GPL2; ▶Pathological (repo) Halted Python GPL2
The Lord of the Rings Volume 1 # Action RPG: ▶Lord of the Rings game engine (repo) Playable Halted C
Lose Your Marbles # Puzzle: ▶Lose Your Marbles (repo) Sporadic JavaScript MIT
Lugaru: The Rabbit's Foot # Action: ▶Lugaru (repo) Active C++ GPL2
Lumines # Puzzle: ▶luminesk5 (repo) Halted Objective-C GPL3
M.A.X. # RTS TBS: ▶Mechanized Assault and eXploration Reloaded (repo) Sporadic C++
M.U.L.E. # TBS: ▶mewl (repo) Sporadic C++ GPL2
Mad TV # Strategy Simulation Management: ▶TVTower (repo) Active Blitz BASIC C
Magic Carpet # FPS: ▶magiccarpet (repo) Halted C++
Magical Drop # Puzzle
マジカルドロップ
MagiDro
マジドロ: ▶Krystal Drop (repo) Halted C++ GPL2
Manic Miner # Platform: ▶Manic Miner (repo) Blitz BASIC
Marathon # FPS Sci-Fi
Marathon 2
Marathon Infinity: ▶Aleph One (repo) Playable Active C++ Lua GPL3
Marble Madness # Arcade: ▶Marble Madness 3d (repo) Halted C++; ▶Trackballs (repo) Halted C++
Mario World # Platform: ▶Full Screen Mario (repo) Playable Active JavaScript; ▶Mari0 (repo) Lua LÖVE; ▶Secret Maryo Chronicles (repo) Sporadic C++
Master of Orion Series # TBS 4X Sci-Fi
Master of Orion 2: ▶OpenMOO2 (repo) Sporadic Python
Maxit # Strategy: ▶KittenMaxit (repo) Sporadic LibGDX MIT; ▶Maxit (repo) Java; ▶Maxit (repo) Sporadic C++ BSD
Maxit # TBS: ▶KittenMaxit (repo) Sporadic LibGDX MIT; ▶Maxit (repo) Java; ▶Maxit (repo) Sporadic C++ BSD
The Maze of Galious # Platform: ▶The Maze of Galious (repo) C++ GPL2
MechCommander 2 # RTS: ▶MechCommander 2 Omnitech (repo) Halted C++ MS-PL
MechWarrior # Simulation FPS Vehicular Combat Sci-Fi Management: ▶LinWarrior (repo) Halted C++ Apache
Medal of Honor: Allied Assault # FPS: ▶OpenMoHAA (repo) Unplayable Sporadic C SDL GPL2
based on ioquake3
Mega Lo Mania # RTS: ▶Gigalomania (repo) Playable Sporadic C++
MegaMan # Platform: ▶Executive Man (repo) Active JavaScript Custom; ▶Rockbot (repo) Active C++ SDL GPL2
Meridian 59 # RPG: ▶Meridian 59 German Server 112 (repo) Active C GPL2; ▶Meridian 59 Server 105 (repo) Active C GPL2; ▶Open Meridian (repo) Active C GPL2
Metroid Prime # FPS Adventure: ▶urde (repo) Active C++ Python MIT
engine only
Mice Men # Puzzle: ▶Mice Men Remix (repo) Playable Complete Java libgdx GPL3
Micro Machines # Racing: ▶Microracers (repo) Halted C++ GPL2
Millipede # Arcade: ▶Monsters and Mushrooms (repo) Halted Python GPL2
Minecraft # Action FPS Survival Sandbox Fantasy: ▶Digbuild (repo) Halted C++ GPL2; ▶Gnomescroll Playable Halted C++ GPL3; ▶Hematite (repo) Active Rust MIT; ▶Manic Digger (repo) Sporadic C#; ▶Minetest (repo) Active C C++ Open GPL2 CC-BY-SA; ▶pycraft (repo) Active Python GPL2; ▶Terasology (repo) Playable Active Java Apache; ▶TrueCraft (repo) Active C# MIT; ▶Voxelands (repo) Active C++ GPL3
Minesweeper # Puzzle: ▶Minesweeper (repo) Halted F#
iOS; ▶Minesweeper (repo) Playable Sporadic JavaScript React Redux Free; ▶Minesweeper.Zone (repo) Playable Active JavaScript Open
Open source JavaScript Minesweeper clone with high scores
Missile Command # Arcade: ▶Missile Command (repo) Playable Halted Lua
Missile Command # Arcade: ▶Missile Command (repo) Playable Halted Lua
Monty Mole # Platform: ▶Monty Mole PC remake (repo) Halted C++
Moonbase Commander # TBS: ▶Scorched Moon (repo) Sporadic Python GPL3
Mortal Kombat # Fighting Fantasy: ▶mk.js (repo) Playable Halted JavaScript MIT
Movie Business # Strategy TBS Management: ▶movbizz (repo) Active PHP JavaScript MIT
Nebulus # Arcade: ▶Toppler Sporadic C++
The Need for Speed # Racing: ▶OpenNFS1 (repo) Halted C#
Need For Speed II SE # Racing: ▶NFSIISE (repo) Playable Active C++ SDL2 Commercial
Nether Earth # RTS: ▶Nether Earth Remake (repo) C++
Neverwinter Nights # RPG Fantasy Sci-Fi Martial Arts
Neverwinter Nights 2
Star Wars: Knights of the Old Republic
Star Wars: Knights of the Old Republic II – The Sith Lords
Jade Empire
Sonic Chronicles: The Dark Brotherhood
The Witcher
Dragon Age: Origins
Dragon Age II: ▶xoreos (repo) Unplayable Active C++ OpenGL SDL2 Commercial GPL3
Night Stalker # Arcade: ▶Afternoon Stalker (repo) Sporadic C++ GPL2
Nodes of Yesod # Platform: ▶Nodes of Yesnod remake (repo) Halted C# XNA
Nuclear Reaction # Puzzle: ▶c64-nuclearreaction (repo) C Assembly GPL3; ▶chainreaction (repo) Java GPL3
Octopus # Arcade: ▶Octopus (repo) Active Swift
Apple TV 4 required
Oddworld # Platform Adventure
Oddworld: Abe's Oddysee
Oddworld: Abe's Exoddus: ▶alive (repo) Active C++ MIT
One Must Fall: 2097 # Fighting Sci-Fi: ▶OpenOMF (repo) Playable Active C Free MIT
single player, 2 player and network play work, content from omf2097.com; ▶Ruby OMF 2097 Remake (repo) Halted Ruby BSD4
Outcast # Adventure Action: ▶OpenOutcast (repo) Halted C++ GPL2
Outrun # Arcade Racing
アウトラン
Auto Ran: ▶Cannonball (repo) Playable Active C++ Commercial; ▶Outrun (repo) Active QuickBASIC QB64
Overflow # Puzzle: ▶JOverflow (repo) Halted Java
Oxyd # Puzzle: ▶Enigma (repo) Sporadic C++ SDL GPL2
Panzer General # TBS: ▶LGeneral (repo) Playable Halted C; ▶Open Panzer (repo) Active HTML5; ▶OpenGeneral Sporadic C++
Paradroid # Shmup Puzzle Fantasy Sci-Fi: ▶FreedroidClassic Complete C; ▶Nighthawk (repo) Playable Halted C++
Paratrooper # Arcade: ▶Paratrooper (repo) Halted Python
Phantasy # RPG: ▶Phantasy (repo) Halted Java
Pipe Mania # Puzzle: ▶Pipemania (repo) Halted Lua Love3D
Pitfall! # Arcade Platform: ▶div-pitfall (repo) Active DIV Games Studio MIT
Pokémon # RPG: ▶OpMon (repo) Active C++ SFML; ▶Tuxemon (repo) Playable Active Python Pygame
Pokémon Mystery Dungeon # RPG: ▶PKMN-FX (repo) Active Java GPL3
Pole Position # Sports Racing Motorsports: ▶grid-leader (repo) Halted Python Panda3D
Populous: The Beginning # RTS: ▶OpenPop (repo) Halted C++ GPL3
Portal # FPS Puzzle: ▶glPortal (repo) Sporadic C++
Prince of Persia # Platform: ▶FreePrince Playable Halted C; ▶SDLPoP (repo) Playable Active C
Progress Quest # MMORPG Comedy: ▶pq2 (repo) Active C++ ncurses GPL3
Pushover # Platform Puzzle: ▶Pushover (repo) Playable Sporadic C++
Puzznic / Brix # Puzzle Arcade: ▶Wizznic! (repo) Playable Active C
Q*bert # Arcade: ▶Q-Bert-Remake (repo) Active C#; ▶ReQbert (repo) Halted HTML5 GPL3
Quadnet # Arcade: ▶Mauvenet (repo) C++
Quake # FPS: ▶DarkPlaces (repo) Active C GPL2; ▶ezQuake (repo) Active C GPL2; ▶ProQuake 4 (repo) C GPL2; ▶QuakeSpasm (repo) Active C GPL2; ▶TyrQuake (repo) Active C GPL2; ▶vkQuake (repo) Active C Vulkan GPL2
Quake 2 # FPS: ▶Jake2 (repo) Active Java GPL2; ▶Yamagi Quake II (repo) Active C GPL2
Quake 3 # FPS: ▶FQuake3 (repo) Sporadic F# GPL2; ▶ioquake3 (repo) Active C; ▶OpenArena (repo) Sporadic C; ▶QuakeJS (repo) Halted JavaScript MIT
R-Type # Shmup: ▶R-Type Clone from Octobinz (repo) C++
demo only; ▶rtype (repo) Halted C++
Railroad Tycoon # Simulation Strategy Management: ▶FreeRails (repo) Halted C++ Java; ▶FreeRails 2 (repo) Halted Java
Rampart # Shmup Puzzle: ▶Castle-Combat (repo) Playable Halted Python; ▶Escalade (repo) Halted Scala; ▶Rampart-Android (repo) Active Java
Android
Raptor: Call of the Shadows # Shmup: ▶raptor (repo) Halted JavaScript
Redneck Rampage # FPS: ▶erampage (EDuke32 fork) (repo) Active C
Rescue! # Action Adventure: ▶Rescue! Max (repo) Halted Java GPL2
Rick Dangerous # Platform: ▶rickyd (repo) Playable Sporadic C++; ▶xrick Playable Halted C
Rise of the Triad # FPS: ▶Rise of the Triad for Linux (repo) Sporadic C
River Raid # Shmup: ▶Ruby Raid (repo) Halted Ruby
Road Fighter # Racing Arcade: ▶Road Fighter (repo) C++ LGPL2
Robotfindskitten # Adventure Roguelike Sci-Fi Meditative Comedy: ▶rfk-inform (repo) Halted Perl
Robotron: 2084 # Arcade: ▶robotron (repo) Active JavaScript
Rodent's Revenge # Puzzle: ▶A Mouse's Vengeance (repo) Active Java; ▶Open Rodent's Revenge (repo) Halted C++ GPL3
RollerCoaster Tycoon # Simulation Strategy Management: ▶FreeRCT (repo) Active C++; ▶OpenRCT2 (repo) Playable Active C++ GPL3
RollerCoaster Tycoon 2 # Simulation Strategy Management: ▶OpenRCT2 (repo) Playable Active C++ GPL3
Ryzom # MMORPG: ▶Ryzom Core (repo) Active C++ AGPL3
Sea Dragon # Action Shooter: ▶zedragon (repo) Active Assembly MIT
Sensible Soccer # Sports Soccer: ▶FreeKick (repo) Active C++ GPL; ▶YSoccer (repo) Playable Sporadic Blitz BASIC GPL
Sensitive # Puzzle Arcade: ▶One Way To Go (repo) Active Lua GPL3; ▶sensitive-js (repo) Active JavaScript
The Sentinel # Puzzle: ▶sentinel (repo) Sporadic Java JavaFX
The Settlers # RTS: ▶Freeserf (repo) Playable Active C
The Settlers # RTS
The Settlers II: ▶Freeserf (repo) Playable Active C
The Settlers II # RTS: ▶Return to the Roots (repo) Active C++
The Settlers III # RTS: ▶JSettlers (repo) Active Java Commercial MIT; ▶MonoStrategy (repo) Halted C# Commercial AGPL3
Seven Kingdoms # RTS: ▶Seven Kingdoms: Ancient Adversaries (repo) Active C++
Shadow Warrior # FPS: ▶JonoF's Shadow Warrior Port (JFSW) (repo) Playable Active C; ▶SWP (repo) C GPL2
Shining Force II # RPG: ▶Shining Force 2 Reverse Engineer (SF2RE) (repo) Sporadic C
reverse engineering project
Shining Soul # Action RPG: ▶Shining Soul Remake (repo) Halted Python pygame As-is
Shobon Action # Platform: ▶Open Syobon Action (repo) Halted C++ GPL2
Sid Meier's Alpha Centauri # TBS: ▶Freeciv Alpha Centauri project (repo) Halted C GPL2
Sid Meier's Colonization # TBS: ▶cc94 (repo) Active C++ Python Commercial AGPL3; ▶FreeCol (repo) Active Java GPL2
Sid Meier's Pirates! # Action Adventure RTS: ▶Crown and Cutlass (repo) Halted C++ BSD
Siege # Puzzle Arcade: ▶FreeSiege (repo) Playable Sporadic C++
Siege of Avalon # Action RPG: ▶Siege of Avalon Open Source (repo) Halted Pascal Custom
Silencer # Action: ▶zSILENCER (repo) Playable Halted C++
Silent Hunter 4 # Action Simulation Submarine Simulator World War II: ▶Danger from the Deep (repo) Sporadic C++
SimCopter # Simulation: ▶sccopter (repo) Unplayable Active C++ MIT
The Sims Online # Simulation Management: ▶FreeSO (repo) Playable Active C# MonoGame MPL; ▶Project Dollhouse (repo) Active C# Monogame Mozilla
SimTower # Simulation Strategy Management: ▶OpenSkyscraper (repo) Playable Active C++
SingStar # Rhythm: ▶UltraStar Deluxe (repo) Playable Active Object Pascal Lua SDL2 GPL2
SkiFree # Arcade Sports Skiing: ▶Skifree-HTML5-clone (repo) Halted HTML5 GPL3; ▶skifree.js (repo) Active JavaScript Custom
Skool Daze # Action Adventure Platform: ▶pyskool (repo) Active Python GPL3
SkyRoads # Platform: ▶OpenRoads (repo) Playable Halted TypeScript HTML5 WebGL MIT; ▶spaceroads (repo) Halted C++ Ogre3D
Slot Racers # Arcade: ▶Slot-Racers (repo) Halted C GPL3
Snake # Arcade: ▶snake (repo) Playable Active Java WTFPL
Snipes #: ▶Snipes (repo) Playable Complete C++ SDL2 Free Custom
reverse-engineered from original binary, aims for 100% logic compatibility with original game
Solar Fox # Arcade: ▶SolarWolf (repo) Python LGPL2
Sopwith # Arcade: ▶SDL Sopwith (repo) Playable Halted C SDL; ▶Sopwith 3 (repo) C++ GPL2
Space Invaders # Arcade: ▶div-spaceinvaders2600 (repo) Active DIV Games Studio MIT; ▶pyspaceinvaders (repo) Halted Python GPL2
Space Rangers # TBS: ▶Space-rangers (repo) Halted C#
Space Rangers 2: Dominators # RTS Adventure Shmup RPG TPS: ▶OpenSR (repo) Active C++ Python
Space Station 13 # RPG Simulation Sci-Fi Comedy Espionage: ▶Griefly (repo) Active C++ Go Python MIT; ▶Space Station 14 (repo) Active C# GPL3; ▶ss13remake (repo) Halted C# GPL3
Speedball 2 # Action Sports Handball Hockey Sci-Fi Cyberpunk: ▶Speedball 2 Semi-Playable Halted C#
reverse engineered prototype
Star Control 2 # RTS: ▶star-control2 (repo) Active C++ MIT; ▶The Ur-Quan Masters (repo) Active C
Star Fox 64 # Action Flight TPS Sci-Fi: ▶UnnamedStarFoxClone (repo) Active C# Unity
Star Raiders # Action Simulation Sci-Fi: ▶Atari8bit_StarRaiders (repo) Halted Assembly
reverse engineering project
Star Trek: Voyager – Elite Force # FPS: ▶RPG-X (repo) Active C GPL2
Star Wars (1983 arcade game) # Arcade: ▶Star-Wars-III (repo) Complete Python GPL2
Starcraft # RTS: ▶Stargus (repo) Sporadic C++ Lua
Stars! # TBS: ▶Freestars (repo) Halted C++ GPL2; ▶NStars! (repo) Halted C# GPL2
Starshatter # Simulation Space Flight Sci-Fi: ▶starshatter-open (repo) Sporadic C++ Custom
Stratosphere: Conquest of the Skies # RTS TPS: ▶openStrato (repo) Active JavaScript WebGL GPL2
Strike Commander # Action Simulation Flight Simulator Modern Military: ▶libRealSpace (repo) Active C++
Strikers 1945 # Shmup: ▶Py1945 (repo) Halted Python GPL
Stunt Car Racer # Racing: ▶Stunt Car Racer Remake (repo) Halted C++; ▶stuntcarremake (repo) Active C++
Stunts # Racing
4D Sports Driving: ▶Ultimate Stunts (repo) Sporadic C++
Styx # Arcade: ▶Styx (repo) Halted C++
SunDog: Frozen Legacy # Role Playing: ▶sundog (repo) Sporadic C MIT; ▶SunDog Resurrection (repo) Sporadic Java Python
Supaplex # Puzzle: ▶splexhd (repo) Halted C++ GPL2
Super Cars # Racing: ▶Supercars III (repo) Sporadic JRL
Super Foul Egg # Puzzle Arcade: ▶SuperFoulEgg (repo) Halted Objective-C Custom
Super Mario # Platform: ▶Mega Mario Playable Halted C++; ▶pucpr-ld-mario3 (repo) Halted Construct2; ▶uMario (repo) Playable Halted C++ SDL2 GPL2
Super Mario # Platform: ▶Mega Mario Playable Halted C++; ▶pucpr-ld-mario3 (repo) Halted Construct2; ▶uMario (repo) Playable Halted C++ SDL2 GPL2
Super Methane Brothers # Platform Arcade: ▶Super Methane Brothers Playable Halted C++; ▶super-methane-brothers-gx (repo) Sporadic C++ GPL2
Wii and GameCube port
Super Monkey Ball # Arcade Platform: ▶irrlamb (repo) Active C++ Irrlicht GPL3; ▶Neverball (repo) Active C++ SDL GPL2; ▶Veraball (repo) Active Gobot MIT
Survivor (1986) # Puzzle: ▶Survivor (repo) Playable Sporadic JavaScript HTML CC-BY-NC
Swing # Puzzle Arcade: ▶XSwing Plus (repo) Sporadic Java GPL3
Syndicate # RTS: ▶FreeSynd (repo) Active C++
Syndicate Wars # RTS: ▶Syndicate Wars Port Playable Halted Commercial GPL3
no network support
System Shock # RPG FPS: ▶Citadel (repo) Unity]
Tempest # Arcade: ▶Arashi-JS (repo) Halted JavaScript; ▶Space Twitch (repo) Active C#; ▶wbta (repo) Active Java
Android
Terraria # Action Platform Survival Sandbox Fantasy: ▶LastTry (repo) Active Java LibGDX MIT; ▶Terraria (repo) C#
Reverse engineered code; ▶terrarium (repo) Active C++
Test Drive # Racing: ▶opengl_test_drive_clone (repo) C GPL3
Tetris # Puzzle Arcade: ▶tetris (repo) Java WTFPL
Tetris Attack # Puzzle Arcade: ▶Crack Attack! (repo) Playable Halted C++
networking support; ▶FreeBlocks Playable Halted C SDL2; ▶Panel Attack (repo) Playable Active Lua
basic networking support
Theme Hospital # Strategy Simulation Management Comedy: ▶CorsixTH (repo) Playable Active C++ Lua SDL2 Commercial MIT
time-based releases
Theme Park # Strategy Simulation Management Comedy: ▶Theme Park Builder 3D CAD (repo) Halted C++ OpenGL SDL GPL2
Thief # Action Adventure Crime Fantasy: ▶openDarkEngine (repo) Unplayable Halted C++ GPL2
Thromolus # Puzzle: ▶thromolusng (repo) Halted Python GPL3
Thrust # Arcade: ▶Thrust (repo) Halted C GPL2
Tiny Wings # Arcade: ▶Tiny Wings (repo) Halted Objective-C MIT
Titus the Fox # Platform
Moktar: ▶OpenTitus (repo) Sporadic C SDL
Tomb Raider # Platform Adventure Action: ▶OpenLara (repo) C++ WebGL BSD 2-Clause; ▶OpenRaider Active C++; ▶OpenTomb (repo) Active C++
Total Annihilation # RTS: ▶Spring (repo) Active C++ Java Python; ▶Total Annihilation 3D (repo) Sporadic C++
Touhou # Shmup Bullet Hell Anime: ▶PyTouhou (repo) Active Python; ▶Taisai Project (repo) Playable Halted C
TrackMania # Racing: ▶ManiaDrive (repo) C PHP
Transplant # Arcade: ▶Spaceship Duel (repo) Sporadic C# BSD
Transport Tycoon # Strategy Simulation Management
Transport Tycoon Deluxe: ▶OpenTTD (repo) Playable Active C++ Swappable GPL2
Tranz Am # Arcade: ▶Tranzam (repo) Halted C++
Tron # Arcade: ▶newtron (repo) Halted JavaScript; ▶Tron (repo) JavaScript HTML jQuery CSS
Turmoil # Arcade: ▶datastorm (repo) Active C Apache
Turnabout # Puzzle: ▶turnabout (repo) Halted CoffeeScript
Turok # FPS: ▶TurokEX (repo) Halted C++ GPL2
Turrican # Shmup: ▶Hurrican Playable Halted C++
Makefile needs edits to compile on Linux
Tyrian # Shmup: ▶OpenTyrian (repo) Sporadic C; ▶Tyrian Remake (repo) Sporadic Java GPL2
Ugh! # Arcade: ▶UGH-remake (repo) Halted C
Ultima II: The Revenge of the Enchantress # RPG: ▶UiirJS (repo) Halted JavaScript
Ultima IV # RPG: ▶xu4 (repo) Active C++
Ultima Online # MMORPG: ▶Iris2 (repo) Playable Halted
Ultima VI # RPG
The Savage Empire
Martian Dreams: ▶Nuvie (repo) Active C++
Ultima VII # RPG: ▶Exult (repo) Sporadic C++
Ultima VIII # RPG: ▶Pentagram (repo) Sporadic C++
Uncharted Waters # Adventure Strategy RPG Alternate Historical: ▶Uncharted waters 2 remake (repo) Active Java GPL2
Uninvited # Adventure: ▶uninvited (repo) Sporadic Inform Artistic
Urban Assault # FPS: ▶UA_source (repo) C++ SDL GPL2
Utopia # TBS: ▶Utopia (repo) Halted JavaScript
Viper # Arcade: ▶viper (repo) Halted CoffeeScript
Vlak # Arcade: ▶Train (repo) Sporadic Java BSD
Warcraft II # RTS: ▶Wargus (repo) Sporadic C++ Lua
Warcraft: Orcs & Humans # RTS: ▶OpenWar (repo) Unplayable Sporadic Go Commercial GPL3; ▶warcraft-remake (repo) Active Java Commercial GPL2; ▶WinWar (repo) Halted C# Commercial
Wario Land 3 # Platform: ▶Wario-Land-3 (repo) Active Python Pygame
Warlords II # TBS: ▶FreeLords (repo) Active Java GPL2
Warrior Kings # RTS: ▶wkbre (repo) Active C++ GPL3
Warzone 2100 # RTS: ▶Warzone 2100 (repo) Active C++
Where in the World Is Carmen Sandiego? (1985) # Puzzle: ▶thiefcatcher (repo) Active C++ GPL3
Willow # Arcade: ▶Willow-Game-Remake (repo) Halted C++
Wing Commander: Privateer # Action Adventure Simulation Sci-Fi: ▶Privateer - Gemini Gold (repo) Sporadic C++
Wizard of Wor # Arcade: ▶KnightOfWor (repo) Active Java GPL3
Wizardry # RPG: ▶Wizardry Legacy (repo) Active C++ GPL3
Wolfenstein 3D # FPS
Spear of Destiny: ▶ECWolf (repo) Active C++
Wolfenstein: Enemy Territory # FPS: ▶ET: Legacy (repo) Active C C++ Lua Commercial
World of Goo # Puzzle: ▶OpenGoo (repo) Unplayable Active
World of Warcraft # MMORPG Fantasy: ▶PseuWoW (repo) Unplayable Halted C C++ GPL2
Can only connect to MaNGOS Servers (FOSS reimplementation of World of Warcraft servers).
X-COM Series # Strategy RTS Turn-Based Tactics Horror Sci-Fi
X-COM: UFO Defense
X-COM: Terror from the Deep
X-COM: Apocalypse
UFO: Enemy Unknown: ▶OpenApoc (repo) Active C++ MIT; ▶OpenXcom (repo) Playable Active C++ GPL3
EU fully playable, TftD in development; ▶UFO2000 (repo) Playable Halted C++
X-It # Puzzle: ▶xit (repo) Halted JavaScript
Xenon 2 Megablast # Shmup: ▶Phavon (repo) Halted C GPL2
XPilot # Arcade: ▶XPilot NG (repo) Halted C GPL2
XQuest # Arcade: ▶XQuest 2 (repo) Pascal Custom
Z # RTS: ▶The Zod Engine (repo) Active
Zarch # Action TPS
Virus: ▶Ajax3d (repo) Halted JavaScript GPL2; ▶Z Virus (repo) Blitz BASIC; ▶Z Virus V2 (repo) Blitz BASIC
Zombie Apocalypse # Shmup: ▶zombie apocalypse html5 (repo) Halted JavaScript HTML5
Zoop # Puzzle: ▶KZap (repo) Halted C++ GPL2; ▶Zoop (repo) Java
Zork # Adventure: ▶zorkClone (repo) Active Java Apache; ▶Zorkish (repo) Sporadic C++
Zuma # Puzzle: ▶Zaz (repo) Halted C++ GPL3

List of clones

Games which are very similar to or heavily inspired by a game or series.

A-Train # Simulation: ▶FreeRails (repo) Halted C#
Age of Empires # RTS: ▶0 A.D. (repo) Playable Active C++ GPL2
Age of Empires # RTS: ▶0 A.D. (repo) Playable Active C++ GPL2
Anno series # RTS: ▶Unknown Horizons (repo) Active Python
Arkanoid # Arcade: ▶Ball And Wall (repo) Active JavaScript MIT; ▶PyBreak360 (repo) Active Python
ARMA series # FPS Modern Military
ARMA: Armed Assault
ARMA 2
ARMA 3
Operation Flashpoint: ▶Uebergame (repo) Playable Active TorqueScript HLSL GLSL C Torque 3D Open MIT CC0
Artemis: Spaceship Bridge Simulator # Simulation Sci-Fi: ▶Space Nerds In Space (repo) Active C GPL2
Battle Chess # TBS: ▶Brutal Chess (repo) Halted C++ GPL2
Battle City # Arcade: ▶BattleCity2014 (repo) Sporadic C++ Ogre3D EntityX
Battle Isle series # TBS: ▶Advanced Strategic Command (repo) Playable Sporadic C++ GPL2; ▶Crimson Fields (repo) Playable Sporadic C++
Battle Zone # FPS Arcade: ▶BZFlag (repo) Playable Active C++
BeamNG.drive # Simulation: ▶Rigs of Rods (repo) Playable Active C C++ AngelScript Python OGRE3D Engine GPL3
Board Game # Compilation Board Game: ▶VASSAL (repo) Playable Active Java GPL2
Brain Blasters # Puzzle: ▶brainblast (repo) Sporadic C++
Breakout # Arcade: ▶Breakout VR (repo) Sporadic C# ASP GLSL MIT; ▶BRIQUOLO (repo) Halted C++ GPL3
Candy Crush Saga # Puzzle: ▶CookieCrunch (repo) Sporadic Swift As-is
Civilization II # TBS 4X Alternate Historical Management: ▶C-Evo (repo) Playable Delphi PD; ▶Freeciv (repo) Active C GPL2; ▶Play Freeciv! (repo) Active C Java JavaScript AGPL3
online browser game
The Clue! # Adventure: ▶Der Clou! (repo) Sporadic C
Company of Heroes series # RTS World War II
Company of Heroes: Opposing Fronts
Company of Heroes: Tales of Valor
Company of Heroes 2: ▶Spring: 1944 (repo) Playable Very Active Lua Spring RTS Engine GPL CC-BY-NC
Gameplay is a mix of Company of Heroes and Supreme Commander
Crazy Machines series # Puzzle Simulation
Crazy Machines: The Wacky Contraptions Game
Crazy Machines 2
The Incredible Machine
The Incredible Machine 2
The Incredible Machine 3
Return of the Incredible Machine: Contraptions
The Incredible Machine: Even More Contraptions
Incredible Toons: ▶The Butterfly Effect (repo) Playable Active C++ Qt Box2D GPL2
Crimsonland # Shmup: ▶Violetland (repo) Playable Active C++ GPL3 CC-BY-SA
DEFCON # RTS: ▶Dupocracy (repo) Active HTML5
Diablo # RPG Action Horror Fantasy Medieval: ▶Flare (repo) Active C++ GPL3; ▶Summoning Wars (repo) Active C++ Lua GPL3
Dungeon Keeper # Strategy RTS Horror Fantasy Comedy: ▶OpenDungeons (repo) Active C++
Dungeon Keeper # Simulation RTS: ▶OpenDungeons (repo) Active C++
Dungeon Keeper 2 # Simulation RTS: ▶OpenKeeper (repo) Unplayable Active Java JMonkeyEngine Commercial GPL3
Elite # Action Simulation Flight Simulator Sci-Fi: ▶Oolite (repo) Active
Elite II # Action Simulation Flight Simulator Sci-Fi Espionage: ▶Pioneer (repo) Playable Active C++ C Lua GPL3
Escape Velocity # Action Simulation: ▶Endless Sky (repo) Active C++ GPL3; ▶Naev (repo) Active C
Falcon # Simulation: ▶FreeFalcon (repo) Active C++ BSD2
win32
Fall Down # Arcade: ▶ativayeban (repo) Playable Halted C SDL GPL2; ▶Falling Time (repo) Playable Halted C SDL2 GPL2
Fire Power # Action: ▶OpenFire (repo) Active C MIT
Guitar Hero # Rhythm: ▶Performous (repo) Playable Active C++; ▶Stepmania (repo) Playable Active C++ Lua
Guitar Hero # Rhythm
SingStar
Dance Dance Revolution: ▶Performous (repo) Playable Active C++; ▶Stepmania (repo) Playable Active C++ Lua
Hack # Roguelike
Rogue
NetHack: ▶SLASH'EM (repo) Halted C NGPL
Heroes of Might and Magic III # TBS: ▶Ancient Beast (repo) Playable Active JavaScript HTML5 Phaser
Herzog Zwei # RTS: ▶Herzog 3D (repo) Halted GPL2
Infinity Loop # Puzzle: ▶IO Reboot (repo) Playable Complete C# Unity Open MIT
Legend of Zelda # Action Adventure: ▶Fanwor (repo) Playable Active C SDL GPL2; ▶Open Zelda (repo) Playable Halted C++; ▶The Legend Of Zelda - Navi's Quest (repo) Complete C++ SDL; ▶The Legend Of Zelda - Oni Link Begins (repo) Complete C++; ▶The Legend Of Zelda - Picross (repo) Complete C++; ▶The Legend Of Zelda - Return Of The Hylan (repo) Complete C++; ▶The Legend Of Zelda - Time To Triumph (repo) Complete C++
Lemmings # Puzzle: ▶Lemmings.ts (repo) Playable Active TypeScript MIT; ▶Lemmini (repo) Playable Active Java Apache 2.0; ▶Lemmix (repo) Playable Halted Delphi; ▶Lix (repo) Playable Active C++; ▶Pingus (repo) Playable Sporadic C++ SDL2, boost (partial) Open GPL3
Little Fighter 2 # Fighting
LF2: ▶F.LF (repo) Playable Complete JavaScript Swappable Creative Commons
The Lost Vikings # Platform: ▶freeVikings (repo) Sporadic Ruby GPL2
Lotus Esprit Turbo Challenge # Racing: ▶RacerJS (repo) Halted JavaScript MIT
Magic: The Gathering Online # Strategy TBS Card Game Fantasy: ▶Forge (repo) Playable Very Active Java; ▶Magarena (repo) Playable Very Active Java; ▶XMage (repo) Playable Very Active Java
Mario Kart # Racing: ▶SuperTuxKart (repo) Playable Active C++
Master of Monsters # TBS Fantasy
Warsong: ▶The Battle for Wesnoth (repo) Active C++ C Java Python Lua GPL2
Master of Orion Series # TBS 4X Sci-Fi
Master of Orion 2: ▶FreeOrion (repo) Sporadic C++ Python Open GPL2 CC-BY-SA
Microsoft Flight Simulator # Simulation: ▶FlightGear (repo) Active C++
Microsoft Train Simulator # Simulation: ▶OpenRails (repo) Active C#
Missile Command # Arcade: ▶ICBM3D (repo) Halted C
Missile Command # Arcade: ▶ICBM3D (repo) Halted C
Mortal Kombat # Fighting Fantasy: ▶OpenMortal (repo) Sporadic C++
Natural Selection # FPS: ▶Tremulous (repo) Halted C; ▶Unvanquished (repo) Active C
Nexuiz # FPS: ▶Xonotic (repo) Playable Active C
Omega Race # Arcade: ▶Omega Race Remake (repo) Sporadic C#; ▶Torrega Race (repo) Playable Halted Lua LÖVE GPL3
Paradroid # Shmup Puzzle Fantasy Sci-Fi: ▶FreedroidRPG (repo) Playable Active Python C Lua GPL2
Pizza Tycoon # Simulation: ▶Pizza Business (repo) Halted C++ GPL2
Punch-Out!! # Fighting Sports Boxing Comedy: ▶THREEPunchOut (repo) Active JavaScript
Puzzle Bobble # Puzzle Arcade: ▶Frozen Bubble (repo) Sporadic Perl
RPG Maker # RPG: ▶EasyRPG Player (repo) Playable Active C++ GPL3
2000/2003 interpreter; ▶mkxp (repo) Playable Sporadic C++ GPL2
RGSS (XP, VX, VX Ace) implementation
The Settlers # RTS: ▶Widelands (repo) Active C++ Lua Python
The Settlers # RTS
The Settlers II: ▶Widelands (repo) Active C++ Lua Python
Ship Simulator series # Simulation
Ship Simulator 2006
Ship Simulator 2008
Ship Simulator Extremes: ▶Bridge Command (repo) Playable Active C++ Irrlicht GPL2
Simcity # Simulation Management: ▶3d.city (repo) Halted JavaScript HTML5 GPL3; ▶Lincity (repo) Halted C GPL; ▶LinCity-NG (repo) Active C++ GPL2; ▶Micropolis (repo) Halted C++ Python GPL; ▶MicropolisJS (repo) Halted JavaScript HTML5 GPL3; ▶OpenCity (repo) Halted C++ GPL2
SkyRoads # Platform: ▶Orbit-Hopper (repo) Halted C++ GPL2
Snake # Arcade: ▶Gusty's Serpents (repo) Halted C++ GPL2
Sokoban # Puzzle: ▶CavePacker (repo) Playable Active C SDL GPL3
Sonic the Hedgehog # Platform: ▶Open Surge (repo) Sporadic C; ▶Sonic Robo Blast 2 (repo) Active C Lua
Story of Seasons series # Simulation Anime
Harvest Moon: ▶Harvest Cynthia (repo) Unplayable Sporadic C++ GPL3
Project name undecided and may change in the future.
Super Hexagon # Rhythm: ▶Open Hexagon (repo) Playable Active C++
Super Mario # Platform: ▶Super Mario Bros And Level Editor in C# (repo) Active C# MIT; ▶Super Mario Bros With SFML in C# (repo) Active C# GPL2; ▶Super Mario War (repo) Playable Halted C++; ▶SuperTux (repo) Playable Active C++ SDL2, boost (partial) Open GPL3
Super Mario # Platform: ▶Super Mario Bros And Level Editor in C# (repo) Active C# MIT; ▶Super Mario Bros With SFML in C# (repo) Active C# GPL2; ▶Super Mario War (repo) Playable Halted C++; ▶SuperTux (repo) Playable Active C++ SDL2, boost (partial) Open GPL3
Tetris # Puzzle Arcade: ▶4DTris (repo) Halted C GPL2; ▶Hextris (repo) Active JavaScript GPL3
Tetris Attack # Puzzle Arcade: ▶Block Attack - Rise of the Blocks (repo) Active C++ SDL2 GPL
Thief # Action Adventure Crime Fantasy: ▶The Dark Mod (repo) Playable Active C++
Thrust # Arcade: ▶Super Transball 2 (repo) Complete C++ GPL3; ▶Transball GL (repo) Halted C++ GPL2
Toobz # Puzzle: ▶Marblez (repo) Playable C# Unity MIT
TrackMania # Racing: ▶Stunt Rally (repo) Playable Active C C++ OGRE3D Engine VDrift Engine GPL3
Transport Tycoon # Strategy Simulation Management
Transport Tycoon Deluxe: ▶Simutrans (repo) Playable Active C++ Artistic
Tribal Hero # MMORPG: ▶Danger Zone (repo) Unplayable Active Java
Ugh! # Arcade: ▶CaveExpress (repo) Playable Active C SDL GPL3
VVVVVV # Puzzle Platform: ▶WWW (repo) Halted JavaScript HTML5 GPL3
Warcraft II # RTS: ▶Dark Oberon (repo)
Wipeout # Racing: ▶Core Breach (repo); ▶Ecksdee (repo) Halted C++ GPL2; ▶H-Craft Championship (repo) Active C++ ZLIB; ▶HexGL (repo) Active HTML5 WebGL MIT; ▶RGP - Racing Game Project (repo) Halted Python Blender; ▶The Rush (repo) Halted C++ GPL2
Wolfenstein 3D # FPS
Spear of Destiny: ▶Voxelstein 3D (repo) Halted C++ MIT
Worms Series # TBS: ▶Hedgewars (repo) Active Pascal C++ Haskell; ▶WarMUX (repo) Sporadic C++
X-COM Series # Strategy RTS Turn-Based Tactics Horror Sci-Fi
X-COM: UFO Defense
X-COM: Terror from the Deep
X-COM: Apocalypse
UFO: Enemy Unknown: ▶Project: Xenocide (repo) Halted C++ GPL2; ▶UFO: Alien Invasion (repo) Active C; ▶X-Force: Fight For Destiny (repo) Sporadic Delphi Kylix GPL2; ▶Xenowar (repo) Playable Halted C++
XOR # Puzzle: ▶XorCurses (repo) Complete; ▶XorGramana (repo) Complete