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.

Sporadic
No preview
D3es

Clone of Doom 3

d3es adds multithreading and custom-framebuffer rendering to dhewm3, a GPL Doom 3 source port, requiring an owned copy of the game data.
Platforms:WindowsLinuxOSX
Stars33
Updated5 months ago
LicenseGPL-3.0
Release2019
Genre: FPS
Theme: Sci-Fi
Halted
No preview
Thunder&Lightning

Clone of Carrier Command

An open-source futuristic flight-sim/action game inspired by the 1988 vehicle-sim classic Carrier Command.
Platforms:OSX
Stars33
Updated2 years ago
LicenseUnknown
Release2010
Genre: Real-Time Strategy
Theme: Sci-Fi
Active
BBC Master Elite screenshot
BBC Master Elite

Clone of Elite

Ian Bell and David Braben's 1986 Acornsoft Elite source for the BBC Master, hand-reconstructed and documented by Mark Moxon.
Platforms:BBC Micro
Stars32
Updated11 days ago
LicenseUnknown
Release2021
Genre: Action
Theme: Sci-Fi
Halted
No preview
Re-Comprehend

Clone of Oo-Topos

Re-Comprehend is a public-domain reimplementation of the Graphics Magician engine behind Transylvania, Crimson Crown, and Oo-Topos.
Platforms:Linux
Stars32
Updated11 years ago
LicenseCC0-1.0
Release2015
Genre: Adventure
Theme: Sci-Fi
Halted
SuperStarTrek - Perl and LUA ports screenshot
SuperStarTrek - Perl and LUA ports

Clone of Super Star Trek

Faithful Perl and Lua ports of the 1978 BASIC-published Super Star Trek game by Mike Mayfield and Bob Leedom.
Platforms:None
Stars32
Updated5 years ago
LicenseUnknown
Release2020
Genre: Simulation
Theme: Sci-Fi
Halted
1oom screenshot
1oom

Clone of Master of Orion

1oom is a from-scratch, GPLv2 engine recreation of Master of Orion (1993), requiring the original game's data files to run.
Platforms:WindowsLinuxDOS
Stars31
Updated3 years ago
Licensegpl-2.0+
Release2018
Genre: Turn-Based Strategy
Theme: Sci-Fi
Halted
No preview
Elite Reinforce

Clone of Star Trek: Voyager – Elite Force

Elite Reinforce is a source port of Star Trek: Voyager – Elite Force's singleplayer campaign, focused on bugfixes and speedrunning.
Platforms:Windows
Stars31
Updated1 year ago
LicenseUnknown
Release2017
Genre: FPS
Theme: Sci-Fi
Halted
MechCommander 2 Omnitech screenshot
MechCommander 2 Omnitech

Clone of MechCommander 2

MechCommander 2 Omnitech is a mod building an upgraded, more moddable version of MechCommander 2 from Microsoft's Shared Source release.
Platforms:Windows
Stars31
Updated13 years ago
LicenseUnknown
Release2012
Genre: Real-Time Tactics
Theme: Sci-Fi
Halted
The Bilestoad screenshot
The Bilestoad

Clone of The Bilestoad

This repository preserves The Bilestoad's original Apple II source code as unconverted floppy disk images, not a ready-to-run build.
Platforms:Apple II
Stars30
Updated7 years ago
LicenseUnknown
Release2019
Genre: Fighting
Theme: Sci-Fi
Sporadic
Doom 64 for Dreamcast screenshot
Doom 64 for Dreamcast

Clone of Doom 64

This is a from-scratch Dreamcast port of Doom 64, built on KallistiOS and requiring the original game's data to run.
Platforms:Dreamcast
Stars29
Updated4 months ago
LicenseUnknown
Release2024
Genre: FPS
Theme: Sci-Fi
Halted
No preview
Mega Man 4 (NES) Disassembly

Clone of Mega Man 4

A complete disassembly of the NTSC-U Mega Man 4 (NES) ROM that reassembles to a byte-for-byte clean ROM, though not all code is documented.
Platforms:NES
Stars29
Updated5 years ago
LicenseUnknown
Release2017
Genre: Platform
Theme: Sci-Fi
Sporadic
No preview
OpenOrion2

Clone of Master of Orion 2

An early open-source remake of Master of Orion II that can currently load and view original savegames.
Platforms:WindowsLinux
Stars29
Updated9 months ago
LicenseGPL-2.0
Release2021
Genre: Turn-Based Strategy
Theme: Sci-Fi
Sporadic
No preview
Project AG

Clone of AeroGauge

An early-stage N64 decompilation project reconstructing AeroGauge's source code, requiring a legitimate ROM to build.
Platforms:N64
Stars29
Updated8 months ago
LicenseUnknown
Release2022
Genre: Racing
Theme: Sci-Fi
Halted
doom64DS screenshot
doom64DS

Clone of Doom 64

Platforms:DS
Stars29
Updated12 years ago
LicenseUnknown
Release2013
Genre: FPS
Theme: Sci-Fi
Sporadic
No preview
Exile disassembly

Clone of Exile

A buildable reconstruction of the BBC Micro game Exile that produces disk images matching the original byte-for-byte, verified by SHA1.
Platforms:BBC Micro
Stars28
Updated5 months ago
LicenseUnknown
Release2016
Genre: Action
Theme: Sci-Fi
Halted
No preview
Magnetar

Clone of StarCraft

Magnetar is a StarCraft mod that loads the original StarCraft.exe into memory and combines it with its own additions.
Platforms:Windows
Stars28
Updated2 years ago
LicenseMIT
Release2016
Genre: Real-Time Strategy
Theme: Sci-Fi
Active
Diggers screenshot
Diggers

Clone of Diggers

A fan remake of Diggers for Windows, macOS, and Linux, using the developer's own Mhatxotic Engine, playable start to finish.
Platforms:WindowsLinuxOSX
Stars26
Updated1 month ago
LicenseUnknown
Release2023
Genre: Puzzle
Theme: Sci-Fi
Active
No preview
Thrust Disassembly

Clone of Thrust

A fully annotated 6502 disassembly of Jeremy C. Smith's 1986 BBC Micro game Thrust, reassembling to the original.
Platforms:BBC Micro
Stars25
Updated1 month ago
LicenseUnknown
Release2016
Genre: Arcade
Theme: Sci-Fi
Halted
Tube64 screenshot
Tube64

Clone of Tube

A 64-bit remake of Bullfrog's little-known 1994 DOS freeware game Tube, built from decompiled source code.
Platforms:WebWindowsLinux
Stars25
Updated2 years ago
LicenseGPL-2.0
Release2021
Genre: Action
Theme: Sci-Fi
Active
Elite Universe Editor screenshot
Elite Universe Editor

Clone of Elite

A tool for creating custom universes for classic BBC Micro and Commodore 64 Elite, supporting three original hardware platforms.
Platforms:WebBBC MicroC64
Stars24
Updated18 days ago
LicenseUnknown
Release2022
Genre: Action
Theme: Sci-Fi
Halted
Galaforce 2 ( BBC Micro ) screenshot
Galaforce 2 ( BBC Micro )

Clone of Galaforce 2

Kevin Edwards' own release of the complete 6502 assembly source for Galaforce 2, reworked to build with the modern BeebAsm toolchain.
Platforms:BBC Micro
Stars24
Updated4 years ago
LicenseUnknown
Release2021
Genre: Shooter
Theme: Sci-Fi
Halted
No preview
DarkMatter Engine

Clone of Quake 3

A Quake III engine project built on Quake3e, unifying classic Quake maps and mods with widescreen UI support; development has halted.
Platforms:Windows
Stars23
Updated5 years ago
LicenseGPL-2.0
Release2021
Genre: FPS
Theme: Sci-Fi
Sporadic
No preview
RZDoom

Clone of Doom

A cross-platform, modernized ZDoom fork for Doom, fully wad/mod-compatible, using FMOD Studio audio and software rendering.
Platforms:WindowsLinuxOSX
Stars23
Updated7 months ago
LicenseGPL-2.0
Release2024
Genre: FPS
Theme: Sci-Fi
Active
Teletext Elite screenshot
Teletext Elite

Clone of Elite

A documented hack of BBC Micro Elite that converts its graphics to the console's teletext Mode 7 display.
Platforms:BBC Micro
Stars23
Updated17 days ago
LicenseUnknown
Release2022
Genre: Action
Theme: Sci-Fi
Halted
No preview
H-Craft Championship

Clone of Wipeout

The released, mostly zlib-licensed source code for H-Craft Championship, originally developed by Irrgheist, for Windows, Linux, and Android.
Platforms:WindowsLinuxAndroid
Stars22
Updated2 years ago
LicenseUnknown
Release2020
Genre: Racing
Theme: Sci-Fi
Halted
MBF-SNM screenshot
MBF-SNM

Clone of Doom

A modification of the MBF Doom source port that adds the fan-made Sigil and Sigil II episodes, targeting DOS.
Platforms:DOS
Stars22
Updated2 years ago
LicenseGPL-2.0
Release2019
Genre: FPS
Theme: Sci-Fi
Halted
No preview
Missile Command

Clone of Missile Command

A clone of Atari's 1980 arcade game Missile Command, built with the LÖVE framework.
Platforms:WindowsLinuxOSX
Stars22
Updated2 years ago
LicenseGPL-3.0
Release2011
Genre: Arcade
Theme: Sci-Fi
Halted
No preview
Starship Command 2022 Edition

Clone of Starship Command

An enhanced 2022 update of Acornsoft's 1983 BBC Micro shooter Starship Command, with faster play and more enemies.
Platforms:BBC Micro
Stars22
Updated2 years ago
LicenseUnknown
Release2022
Genre: Shooter
Theme: Sci-Fi
Halted
Ultimate Play the Game disassemblies screenshot
Ultimate Play the Game disassemblies

Clone of Alien 8

SkoolKit-based disassemblies of several 1980s Ultimate Play the Game ZX Spectrum titles, including Atic Atac and Jetpac.
Platforms:ZX Spectrum
Stars22
Updated2 years ago
LicenseUnknown
Release2021
Genre: Action
Theme: Sci-Fi
Halted
Berserker@Quake2 Engine screenshot
Berserker@Quake2 Engine

Clone of Quake 2

A port of the Berserker@Quake2 engine to SDL2 for Linux and Windows, requiring the player's own Quake II game data; no longer developed.
Platforms:WindowsLinux
Stars21
Updated5 years ago
LicenseGPL-2.0
Release2016
Genre: FPS
Theme: Sci-Fi
Halted
Izmir screenshot
Izmir

Clone of Izmir

The complete executables, data, and source code for Izmir, a 1995 Korean PC game open-sourced for its 20th anniversary, run via DOSBox.
Platforms:DOS
Stars21
Updated5 years ago
LicenseUnknown
Release2015
Genre: Action
Theme: Sci-Fi
Halted
Paybacktime 2 screenshot
Paybacktime 2

Clone of PaybackTime 2

An X-COM-style turn-based tactics game for MS-DOS from 1994-97, released as public domain with full source and set up for DOSBox.
Platforms:WebWindows
Stars21
Updated2 years ago
LicenseUnknown
Release2014
Genre: Turn-Based Tactics
Theme: Sci-Fi
Active
No preview
Chocolate DOOM-3-BFG

Clone of Doom 3

A source port reproducing vanilla Doom 3: BFG Edition on the modernized BFG engine, forked from RBDOOM-3-BFG before shadow mapping.
Platforms:WindowsLinux
Stars20
Updated1 month ago
LicenseGPL-3.0
Release2025
Genre: FPS
Theme: Sci-Fi
Halted
No preview
Mega Man 6 (NES) Disassembly

Clone of Mega Man 6

A complete disassembly of the NTSC-U Mega Man 6 NES ROM that reassembles byte-for-byte, though not all code is documented yet.
Platforms:NES
Stars20
Updated5 years ago
LicenseUnknown
Release2017
Genre: Platform
Theme: Sci-Fi
Halted
No preview
Space Harrier Clone

Clone of Space Harrier

A tribute to Sega's 1985 arcade game Space Harrier, built with SDL2, recreating the first level and its snake-dragon boss fight.
Platforms:Windows
Stars20
Updated8 years ago
LicenseMIT
Release2018
Genre: TPS
Theme: Sci-Fi
Halted
No preview
Star Trek 1971 for Python

Clone of Star Trek

A Python port of a C# rewrite of the original 1971 text-based Star Trek game.
Platforms:None
Stars20
Updated3 years ago
LicenseMIT
Release2014
Genre: Simulation
Theme: Sci-Fi
Halted
No preview
7k2

Clone of Seven Kingdoms II: The Fryhtan Wars

An experimental fork of the 7kfans GPL release of Seven Kingdoms II replacing DirectX/DirectPlay/DirectSound with SDL2, ENet, and OpenAL.
Platforms:Linux
Stars19
Updated10 years ago
LicenseUnknown
Release2012
Genre: Real-Time Strategy
Theme: Fantasy
Halted
No preview
Ironseed

Clone of Ironseed

Platforms:DOS
Stars19
Updated13 years ago
LicenseGPL-3.0
Release2013
Genre: Simulation
Theme: Sci-Fi
Active
No preview
OpenBreed

Clone of Alien Breed

An in-progress C# reimplementation of Team17's Alien Breed games, with an asset editor; not yet playable.
Platforms:Windows
Stars19
Updated17 days ago
LicenseUnknown
Release2018
Genre: action game
Theme: Horror

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