Cloned Games

Free & Open Source Sci-Fi Games

489 free, open-source sci-fi games — real clones and remakes you can download, inspect the source of, and modify.

Active
RPG-X screenshot
RPG-X

Clone of Star Trek: Voyager – Elite Force

A modified Quake III-based engine build for the Elite Force mod RPG-X2, with raised engine limits.
Platforms:WindowsLinuxOSX
Stars19
Updated3 months ago
LicenseGPL-2.0
Release2011
Genre: FPS
Theme: Sci-Fi
Halted
No preview
SotE

Clone of Star Wars: Shadows of the Empire

An in-progress decompilation of a Nintendo 64 prototype build of Star Wars: Shadows of the Empire, verified by SHA1 checksum.
Platforms:N64
Stars19
Updated1 year ago
LicenseUnknown
Release2024
Genre: Action
Theme: Sci-Fi
Halted
No preview
ironseed_fpc

Clone of Ironseed

A Free Pascal port of Iron Seed's original released source code, letting it compile and run natively on GNU/Linux, with ongoing bug fixes.
Platforms:Linux
Stars19
Updated2 years ago
LicenseGPL-3.0
Release2020
Genre: Simulation
Theme: Sci-Fi
Active
Siege Studio screenshot
Siege Studio

Clone of Starsiege

A file-format viewer/converter for reverse-engineered Dynamix game data (Earthsiege, Starsiege, Tribes, Red Baron and more).
Platforms:Windows
Stars18
Updated1 month ago
LicenseMIT
Release2019
Genre: Simulation
Theme: Sci-Fi
Halted
No preview
Space Funky B.O.B.

Clone of B.O.B.

A probably-complete source code release for B.O.B. on the SNES, sourced from romhacking.net.
Platforms:Apple II
Stars18
Updated8 years ago
LicenseUnknown
Release2018
Genre: Platform
Theme: Sci-Fi
Halted
No preview
Corncob 3D

Clone of Corncob 3D

Preserves the source code of Corncob 3D, a 1992 DOS game whose developer said it could be used freely.
Platforms:DOS
Stars17
Updated8 years ago
LicenseUnknown
Release2018
Genre: Simulation
Theme: Sci-Fi
Halted
No preview
DarkReignLauncher

Clone of Dark Reign: The Future of War

Platforms:Windows
Stars17
Updated3 years ago
LicenseMIT
Release2018
Genre: Real-Time Strategy
Theme: Sci-Fi
Active
Gardens of Kadesh screenshot
Gardens of Kadesh

Clone of Homeworld

Gardens of Kadesh is a fan-maintained continuation of Homeworld SDL, an earlier community port of Homeworld's 1999 source code.
Platforms:WebWindowsLinux
Stars17
Updated9 days ago
Licenseother
Release2019
Genre: Real-Time Strategy
Theme: Sci-Fi
Halted
No preview
Jedi Academy

Clone of Star Wars Jedi Knight: Jedi Academy

Raven Software and Activision's official 2003 GPLv2 source code release of Star Wars Jedi Knight: Jedi Academy, not a third-party remake.
Platforms:Windows
Stars17
Updated13 years ago
LicenseGPL-2.0
Release2013
Genre: Fighting
Theme: Fantasy
Halted
OpenMOO2 screenshot
OpenMOO2

Clone of Master of Orion 2

A Python clone of Master of Orion II for Linux that uses the original game's data files; not yet playable.
Platforms:Linux
Stars17
Updated9 years ago
LicenseGPL-2.0
Release2015
Genre: Turn-Based Strategy
Theme: Sci-Fi
Archived
No preview
Allegiance

Clone of Allegiance

Microsoft's official, unsupported source-code release for Allegiance, published as-is after the game's own servers had already shut down.
Platforms:Windows
Stars16
Updated9 years ago
LicenseUnknown
Release2017
Genre: Action
Theme: Sci-Fi
Halted
Blake Stone: Planet Strike screenshot
Blake Stone: Planet Strike

Clone of Blake Stone: Planet Strike

A 2013 public release of Blake Stone: Planet Strike's source code by its original publisher; needs the commercial data files to run.
Platforms:DOS
Stars16
Updated13 years ago
LicenseUnknown
Release2013
Genre: FPS
Theme: Sci-Fi
Halted
No preview
DCDoom

Clone of Doom

Targets Sega Dreamcast, though its README is actually the original 1998 WinDoom documentation, not Dreamcast-specific notes.
Platforms:Dreamcast
Stars16
Updated4 years ago
LicenseUnknown
Release2022
Genre: FPS
Theme: Sci-Fi
Sporadic
No preview
Lilium Arena Classic

Clone of Quake 3

An open-source engine reimplementation of Quake 3 versions 1.09-1.16n, built on ioquake3/ioEF, targeting Linux and macOS.
Platforms:LinuxOSX
Stars16
Updated4 months ago
LicenseGPL-2.0
Release2021
Genre: FPS
Theme: Sci-Fi
Active
No preview
OpenOP2

Clone of Outpost 2

A work-in-progress Outpost 2 mod for the OpenRA engine that needs the GOG release of the original.
Platforms:WindowsLinuxOSX
Stars16
Updated3 months ago
LicenseGPL-3.0
Release2020
Genre: Real-Time Strategy
Theme: Sci-Fi
Halted
No preview
Phantasy

Clone of Phantasy Star

A deprecated remake of Sega's Phantasy Star whose author points users to JLud2D instead.
Platforms:None
Stars16
Updated8 years ago
LicenseUnknown
Release2014
Genre: RPG
Theme: Sci-Fi
Halted
No preview
DCMoHo

Clone of MoHo

Platforms:Dreamcast
Stars15
Updated4 years ago
LicenseUnknown
Release2022
Genre: Action
Theme: Sci-Fi
Halted
No preview
fakk2-rework

Clone of Heavy Metal: F.A.K.K. 2

fakk2-rework is a proposed modernization for Heavy Metal: F.A.K.K. 2's source, with ideas like CMake, cross-platform, and ioquake3 porting.
Platforms:Windows
Stars15
Updated5 years ago
LicenseUnknown
Release2020
Genre: Shooter
Theme: Cyberpunk
Halted
Kiloblaster (SDL) screenshot
Kiloblaster (SDL)

Clone of Kiloblaster

A Linux/SDL port of Kiloblaster that reproduces its music via a bundled DOSBox OPL synth emulator and libgamemusic.
Platforms:Linux
Stars14
Updated14 years ago
LicenseUnknown
Release2012
Genre: Shooter
Theme: Sci-Fi
Halted
Spacewar screenshot
Spacewar

Clone of Spacewar!

A browser-playable, four-player remake of 1962's Spacewar!, first written in Python in 2004.
Platforms:Web
Stars14
Updated10 years ago
LicenseUnknown
Release2011
Genre: Action
Theme: Sci-Fi
Sporadic
Tyrian Remake screenshot
Tyrian Remake

Clone of Tyrian

A Java shoot-'em-up remake of 1995's Tyrian that keeps the original Epic Megagames assets, built on the LionEngine.
Platforms:WebWindowsLinux
Stars14
Updated9 months ago
LicenseGPL-3.0
Release2013
Genre: Shmup
Theme: Sci-Fi
Halted
Warcraft 2000: Nuclear Epidemic screenshot
Warcraft 2000: Nuclear Epidemic

Clone of Warcraft 2000

Official released source code for Warcraft 2000: Nuclear Epidemic, GSC Game World's 1998 RTS built to rival Warcraft II and StarCraft.
Platforms:Windows
Stars14
Updated3 years ago
LicenseUnknown
Release2023
Genre: Real-Time Strategy
Theme: Fantasy
Halted
No preview
crystalisdisassembly

Clone of Crystalis

A reassemblable disassembly of the NES game Crystalis for ca65, about 92% complete on PRG-ROM and 88% on CHR-ROM, free to use uncredited.
Platforms:NES
Stars14
Updated7 years ago
LicenseUnknown
Release2019
Genre: RPG
Theme: Fantasy
Halted
No preview
Atari8bit_StarRaiders

Clone of Star Raiders

A disassembly of Star Raiders' original 6502 assembly source, not a reimplementation; a work in progress and not yet playable.
Platforms:Atari
Stars13
Updated12 years ago
LicenseUnknown
Release2013
Genre: Action
Theme: Sci-Fi
Halted
No preview
Kathodos

Clone of Descent

A Python/Panda3D remake of Descent aiming for the same spirit rather than an exact clone; currently unplayable.
Platforms:None
Stars13
Updated15 years ago
LicenseUnknown
Release2010
Genre: FPS
Theme: Sci-Fi
Halted
Mega Man 7 Disassembly screenshot
Mega Man 7 Disassembly

Clone of Mega Man 7

Platforms:SNES
Stars13
Updated5 years ago
LicenseGPL-3.0
Release2021
Genre: Platform
Theme: Sci-Fi
Archived
No preview
xevious-7800

Clone of Xevious

Platforms:Atari
Stars13
Updated11 years ago
LicenseUnknown
Release2015
Genre: Shooter
Theme: Sci-Fi
Halted
DNF-reimposition screenshot
DNF-reimposition

Clone of Duke Nukem Forever

A mod project for Duke Nukem Forever (2011) adding a level/asset editor and aiming to fix up the base game, unaffiliated with Gearbox.
Platforms:Windows
Stars12
Updated3 years ago
LicenseUnknown
Release2022
Genre: FPS
Theme: Adult
Halted
No preview
EF2GameSource

Clone of Star Trek: Elite Force II

A maintenance update of the Star Trek: Elite Force II game source code, updated to compile under Visual Studio 2017 and on Linux.
Platforms:WindowsLinux
Stars12
Updated8 years ago
LicenseUnknown
Release2012
Genre: FPS
Theme: Sci-Fi
Halted
No preview
Star Control 2: The Ur-Quan Masters

Clone of Star Control 2

The recovered original 3DO source code for Star Control 2, found in 2024 after the 2002 release used incomplete code.
Platforms:3DO
Stars12
Updated2 years ago
LicenseUnknown
Release2024
Genre: Adventure
Theme: Sci-Fi
Halted
Tread Marks (SDL2) screenshot
Tread Marks (SDL2)

Clone of Tread Marks

An unofficial Linux/OpenPandora SDL2 port of the open-sourced tank combat and racing game Tread Marks.
Platforms:Linux
Stars12
Updated4 years ago
LicenseUnknown
Release2017
Genre: Racing
Theme: Sci-Fi
Halted
No preview
Rex disassembly

Clone of Rex

An annotated, browsable disassembly of the ZX Spectrum version of Rex (1988), built with SkoolKit.
Platforms:ZX Spectrum
Stars11
Updated4 years ago
LicenseUnknown
Release2021
Genre: Platform
Theme: Sci-Fi
Halted
No preview
Star-Wars-III

Clone of Star Wars (1983 arcade game)

A remake of just the Death Star trench-run sequence from the 1983 Star Wars arcade game, built in CodeSkulptor.
Platforms:None
Stars11
Updated12 years ago
LicenseGPL-2.0
Release2014
Genre: Arcade
Theme: Sci-Fi
Halted
Transball GL screenshot
Transball GL

Clone of Zarathrusta

A sci-fi multidirectional shooter about recovering stolen energy spheres, playable on Linux, Mac, Windows, or in a browser.
Platforms:WebWindowsLinux
Stars11
Updated6 years ago
LicenseGPL-3.0
Release2016
Genre: Action
Theme: Sci-Fi
Active
Xevious1200 screenshot
Xevious1200

Clone of Xevious

A line-by-line 68K transcode of the arcade Xevious ROMs, targeting Neo Geo hardware and the AGA Amiga.
Platforms:Amiga
Stars11
Updated1 month ago
LicenseUnknown
Release2022
Genre: Shooter
Theme: Sci-Fi
Halted
No preview
spaceroads

Clone of SkyRoads

Platforms:None
Stars11
Updated14 years ago
LicenseUnknown
Release2012
Genre: Platform
Theme: Sci-Fi
Active
No preview
ARCADE!

Clone of Galaga

Commented Z80 assembly source reconstructing Galaga's original arcade ROM code from disassembly, verifiable against MAME.
Platforms:ZX Spectrum
Stars10
Updated2 months ago
LicenseUnknown
Release2015
Genre: Action
Theme: Sci-Fi
Halted
No preview
DCSpeedBall2

Clone of Speedball 2

Platforms:Dreamcast
Stars10
Updated4 years ago
LicenseUnknown
Release2022
Genre: Action
Theme: Sci-Fi
Sporadic
Wizball screenshot
Wizball

Clone of Wizball

A recovered, Linux/PortMaster-revived source release of the 2007 PC/Mac remake of Sensible Software's 1987 Wizball.
Platforms:WindowsLinux
Stars10
Updated5 months ago
LicenseMIT
Release2026
Genre: Shooter
Theme: Sci-Fi

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