Free & Open Source Sci-Fi Games
521 free, open-source sci-fi games — real clones and remakes you can download, inspect the source of, and modify.
Active
Clone of Wipeout
A static recompilation of WipEout built on psxrecomp; the README says the current package is not release-ready.
Halted
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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.
Active
Clone of Quake 2
A static recompilation of Quake II built on psxrecomp and recomp-ui, described as Quake II recompiled for modern systems.
Halted
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.
Halted
Clone of Savage: The Battle for Newerth
The official archived source code release of Savage: The Battle for Newerth, preserved via the Internet Archive.
Halted
Original game image
Original game imageClone of Spacewar!
A Spacewar! clone written in Perl with SDL, created as an entry for the SDL Perl Game Contest.
Sporadic
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.
Halted
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
Archived
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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
Halted
Original game image
Original game imageClone 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.
HaltedOriginal game image
Original game imageClone of Star Trek
Platforms:WindowsLinuxOSX
Stars0
Updated4 years ago
LicenseUnknown
Release2022
Genre: Simulation
Theme: Sci-Fi
Halted
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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
Original game image
Original game imageClone of Mad Planets
This repository preserves a scanned printout of the original 1983 Gottlieb arcade game Mad Planets, for archival and educational purposes.
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Clone of Solaris
Source code said to be the original 1986 Atari 2600 game Solaris, preserved via RomHacking.net.
Halted
Halted
Active
Clone of Gloom (Quake)
Original game imageClone of 360: Three Sixty
Original game image
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Original game imageClone of Unreal Tournament
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