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.

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Shippy 1984

Clone of Galaxians

Platforms:WindowsLinux
Stars3
Updated1 month ago
LicenseGPL-2.0
Release2019
Genre: Action
Theme: Sci-Fi
Halted
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paybacktime

Clone of Payback Time

Source code for Payback Time, a tactical battle game, including a scene editor for building and editing scenes.
Platforms:Windows
Stars3
Updated2 years ago
LicenseMIT
Release2014
Genre: Turn-Based Tactics
Theme: Sci-Fi
Halted
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rfk-inform

Clone of Robotfindskitten

An Inform 6 / Z-machine reimplementation of the ASCII game robotfindskitten, maintained since 2002.
Platforms:None
Stars3
Updated1 year ago
Licenseartistic-2.0
Release2018
Genre: Adventure
Theme: Sci-Fi
Halted
Corridor 8: Galactic Wars screenshot
Corridor 8: Galactic Wars

Clone of Corridor 8: Galactic Wars

A fan-preserved prototype source archive of the DOS game Corridor 8: Galactic Wars, distinct from Corridor 7 despite similar filenames.
Platforms:DOS
Stars2
Updated9 years ago
LicenseUnknown
Release2019
Genre: FPS
Theme: Sci-Fi
Active
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Gravitar

Clone of Gravitar

A transcode of the Gravitar arcade game to Amiga, converting the original 6502 code, sound, and graphics to 68000 assembly.
Platforms:Amiga
Stars2
Updated2 months ago
LicenseUnknown
Release2025
Genre: Shmup
Theme: Sci-Fi
Halted
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MechCommander2HD

Clone of MechCommander 2

An unofficial 'HD' project for MechCommander 2, whose README is mostly Microsoft's Shared Source license text rather than a list of changes.
Platforms:Windows
Stars2
Updated11 years ago
LicenseUnknown
Release2015
Genre: Real-Time Tactics
Theme: Sci-Fi
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Project: Xenocide

Clone of X-COM: UFO Defense

An open-source MonoGame remake of X-COM: UFO Defense (UFO: Enemy Unknown), originally built in XNA around 2007.
Platforms:Windows
Stars2
Updated2 months ago
LicenseMIT
Release2016
Genre: Strategy
Theme: Horror
Archived
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Q2Pro

Clone of Quake 2

Q2PRO is an enhanced, now-archived Quake II client and server adding modern rendering, sound, and networking features.
Platforms:WindowsLinux
Stars2
Updated10 months ago
LicenseGPL-2.0
Release2025
Genre: FPS
Theme: Sci-Fi
Sporadic
Another World for the Commander X16 screenshot
Another World for the Commander X16

Clone of Another World

An assembly-language port of Another World to the 8-bit Commander X16, requiring the player to supply the original MS-DOS data files.
Platforms:C64
Stars1
Updated11 months ago
LicenseGPL-3.0
Release2024
Genre: Adventure
Theme: Sci-Fi
Halted
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EliteGL

Clone of Elite

An OpenGL/SDL port to Linux of Christian Pinder's Elite: The New Kind, itself a Windows/Allegro remake of the original Elite.
Platforms:Linux
Stars1
Updated5 years ago
LicenseUnknown
Release2020
Genre: Action
Theme: Sci-Fi
Halted
FireMadness screenshot
FireMadness

Clone of Crossfire

A top-down bullet-hell shooter built with Castle Game Engine, Free Pascal and Lazarus, free and open-source for Windows and Linux.
Platforms:WindowsLinux
Stars1
Updated8 years ago
Licensegpl-3.0+
Release2018
Genre: Action
Theme: Sci-Fi
Halted
Quake4Doom screenshot
Quake4Doom

Clone of Quake 4

An integration of the Quake 4 SDK into the open-source Doom 3 engine, playable at visual parity except for missing particle effects.
Platforms:Windows
Stars1
Updated1 year ago
LicenseUnknown
Release2025
Genre: FPS
Theme: Sci-Fi
Halted
Savage: The Battle for Newerth screenshot
Savage: The Battle for Newerth

Clone of Savage: The Battle for Newerth

The official archived source code release of Savage: The Battle for Newerth, preserved via the Internet Archive.
Platforms:Windows
Stars1
Updated2 years ago
LicenseUnknown
Release2024
Genre: FPS
Theme: Fantasy
Halted
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SolarConflict

Clone of Spacewar!

A Spacewar! clone written in Perl with SDL, created as an entry for the SDL Perl Game Contest.
Platforms:None
Stars1
Updated14 years ago
LicenseUnknown
Release2011
Genre: Action
Theme: Sci-Fi
Sporadic
Space Invaders Part II screenshot
Space Invaders Part II

Clone of Space Invaders Part II

A from-scratch C++/SDL2/OpenGL clone of the 1979 arcade game Space Invaders Part II, using a custom single-file rendering engine.
Platforms:Linux
Stars1
Updated7 months ago
LicenseMIT
Release2021
Genre: Arcade
Theme: Sci-Fi
Halted
Super Star Trek meets 25th Anniversary screenshot
Super Star Trek meets 25th Anniversary

Clone of Super Star Trek

A remake of the 1978 strategy game Super Star Trek, reimagined with the bridge-crew command interface of Star Trek: 25th Anniversary.
Platforms:WebWindowsLinux
Stars1
Updated1 year ago
LicenseUnknown
Release2025
Genre: Simulation
Theme: Sci-Fi
Halted
No preview
Supernova

Clone of Supernova

A 2018 Free Pascal port of Scott Miller's 1987 MS-DOS game Supernova, best played in an 80x25 terminal.
Platforms:Windows
Stars1
Updated8 years ago
LicenseGPL-2.0
Release2018
Genre: Adventure
Theme: Sci-Fi
Archived
No preview
open-heavy-smash

Clone of Heavy Smash

An archived remake project of the arcade game Heavy Smash, listed as unplayable.
Platforms:None
Stars1
Updated9 years ago
LicenseUnknown
Release2013
Genre: Sports
Theme: Sci-Fi
Halted
opene2140 screenshot
opene2140

Clone of Earth 2140

An early, not-yet-playable C++ reimplementation of the 1997 RTS Earth 2140 that uses the original game files.
Platforms:LinuxOSX
Stars1
Updated3 years ago
Licensegpl-3.0+
Release2020
Genre: Real-Time Strategy
Theme: Sci-Fi
Sporadic
No preview
Ascent

Clone of Descent

A Descent-inspired 3D shooter with six-degrees-of-freedom movement, built in C++ with the OGRE 3D engine; playable but sporadic.
Platforms:None
Stars0
Updated10 months ago
LicenseGPL-3.0
Release2025
Genre: FPS
Theme: Sci-Fi
Halted
No preview
BaconBytes.StarTrek

Clone of Star Trek

A C# port of the classic Star Trek text game, based on a community BASIC rewrite, including multiple translated and rewritten versions.
Platforms:None
Stars0
Updated9 years ago
LicenseUnknown
Release2024
Genre: Simulation
Theme: Sci-Fi
Halted
No preview
ClassicStarTrek

Clone of Star Trek

Platforms:WindowsLinuxOSX
Stars0
Updated4 years ago
LicenseUnknown
Release2022
Genre: Simulation
Theme: Sci-Fi
Halted
No preview
HELLRAIDER

Clone of Hellraider

A disassembly of Hellraider's DOS executable, reverse-engineered into commented, mostly-named 8086 assembly plus its raw graphics data.
Platforms:DOS
Stars0
Updated3 years ago
LicenseUnknown
Release2023
Genre: Shmup
Theme: Sci-Fi
Halted
LibDay screenshot
LibDay

Clone of Liberation Day

An early-stage Unity remake of Liberation Day, still far from playable, with progress limited to tools extracting the original's data.
Platforms:None
Stars0
Updated9 years ago
LicenseMIT
Release2017
Genre: Turn-Based Strategy
Theme: Modern Military
Halted
No preview
Mad Planets

Clone of Mad Planets

This repository preserves a scanned printout of the original 1983 Gottlieb arcade game Mad Planets, for archival and educational purposes.
Platforms:Arcade
Stars0
Updated1 year ago
LicenseUnknown
Release2025
Genre: Shooter
Theme: Sci-Fi
Halted
No preview
Moonsweeper Source

Clone of Moonsweeper

What appears to be the original source code of the Atari game Moonsweeper.
Platforms:Atari
Stars0
Updated1 year ago
LicenseUnknown
Release2025
Genre: —
Theme: Sci-Fi
Halted
No preview
Pesterminator

Clone of Pesterminator: The Western Exterminator

An NES assembly project inspired by Pesterminator: The Western Exterminator, playable in the 8bitworkshop web IDE.
Platforms:Web
Stars0
Updated4 years ago
LicenseUnknown
Release2021
Genre: Platform
Theme: Sci-Fi
Halted
No preview
PlanetaryDefense

Clone of Planetary Defense

A public-domain conversion of Charles Bachand and Tom Hudson's Planetary Defense to the Foenix F256 platform.
Platforms:Foenix
Stars0
Updated1 year ago
LicenseUnknown
Release2022
Genre: Shooter
Theme: Sci-Fi
Halted
No preview
RAID2020

Clone of Raid 2020

A CA65 transfer of Color Dreams' 1989 NES game Raid 2020, buildable and playable in the 8bitworkshop web IDE.
Platforms:Web
Stars0
Updated4 years ago
LicenseUnknown
Release2021
Genre: Action
Theme: Sci-Fi
Halted
Shamus screenshot
Shamus

Clone of Shamus

A Rust remake of the 1982 Atari shooter Shamus, with three levels implemented and enemy AI in progress.
Platforms:None
Stars0
Updated3 years ago
LicenseMIT
Release2023
Genre: Shooter
Theme: Sci-Fi
Halted
Solaris Source screenshot
Solaris Source

Clone of Solaris

Source code said to be the original 1986 Atari 2600 game Solaris, preserved via RomHacking.net.
Platforms:Atari
Stars0
Updated1 year ago
LicenseUnknown
Release2025
Genre: Simulation
Theme: Sci-Fi
Halted
Thunder Force IV Rebirth screenshot
Thunder Force IV Rebirth

Clone of Thunder Force IV

Platforms:Windows
Stars0
Updated10 years ago
LicenseUnknown
Release2015
Genre: Shooter
Theme: Sci-Fi
Halted
Tiny Trek（Pyxel） screenshot
Tiny Trek（Pyxel）

Clone of Tiny Trek

Platforms:None
Stars0
Updated3 years ago
LicenseUnknown
Release2022
Genre: Simulation
Theme: Sci-Fi
Active
Tremulous screenshot
Tremulous

Clone of Gloom (Quake)

Platforms:WindowsLinuxOSX
Stars0
Updated29 days ago
LicenseGPL2, CC-BY-SA*
Release2026
Genre: FPS
Theme: Sci-Fi
1972 Star Trek in Python screenshot
1972 Star Trek in Python

Clone of Star Trek

Platforms:HP calculator
LicenseUnknown
Genre: Simulation
Theme: Sci-Fi
No preview
2ooM

Clone of Master of Orion 2

Platforms:Linux
LicenseGPL2*
Genre: Turn-Based Strategy
Theme: Sci-Fi
No preview
360: Three Sixty

Clone of 360: Three Sixty

Platforms:PS
LicenseUnknown
Genre: Racing
Theme: Sci-Fi
No preview
Abuse

Clone of Abuse

Platforms:LinuxOSX
LicensePD, WTFPL, GPL2*
Genre: Action
Theme: Horror
After Protocol screenshot
After Protocol

Clone of Beyond Protocol

Platforms:Windows
LicenseUnknown
Genre: Real-Time Strategy
Theme: Sci-Fi

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