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.

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NES Pesterminator Source Code

Clone of Pesterminator: The Western Exterminator

Platforms:NES

LicenseUnknown

Genre: Platform

Theme: Sci-Fi

New RAW

Clone of Another World

Platforms:Linux

LicenseGPL2*

Genre: Adventure

Theme: Sci-Fi

Nighthawk

Clone of Paradroid

Platforms:Linux

LicenseGPL2*

Genre: Shmup

Theme: Fantasy

No Gravity

Clone of Wing Commander series

Platforms:WindowsLinuxBeOS

LicenseGPL2*

Genre: Action

Theme: Sci-Fi

Star Wars Jedi Knight: Jedi Academy (original game, not this project)

Original game image

OpenJK

Clone of Star Wars Jedi Knight: Jedi Academy

Platforms:WindowsLinuxOSX

LicenseGPL2*

Genre: Fighting

Theme: Fantasy

OpenJKDF2

Clone of Star Wars Jedi Knight: Dark Forces II

Platforms:WebWindowsLinux

LicenseUnknown

Genre: Fighting

Theme: Fantasy

OpenTrek

Clone of Super Star Trek

Platforms:WindowsLinux

LicenseGPL2*

Genre: Simulation

Theme: Sci-Fi

Tyrian (original game, not this project)

Original game image

OpenTyrian2000

Clone of Tyrian

Platforms:Windows

LicenseGPL2*

Genre: Shmup

Theme: Sci-Fi

Orbit-Hopper

Clone of SkyRoads

Platforms:WindowsLinux

LicenseGPL2*

Genre: Platform

Theme: Sci-Fi

Warhammer 40,000: Chaos Gate (original game, not this project)

Original game image

Ordoor

Clone of Warhammer 40,000: Chaos Gate

Platforms:Linux

LicenseMIT*

Genre: Turn-Based Tactics

Theme: Sci-Fi

Penguin Command

Clone of Missile Command

Platforms:Linux

LicenseGPL2*

Genre: Arcade

Theme: Sci-Fi

Privateer - Gemini Gold

Clone of Wing Commander: Privateer

Platforms:WindowsLinuxOSX

LicenseGPL2*

Genre: Action

Theme: Sci-Fi

Project: Random(SKY)

Clone of Tyrian

Platforms:Windows

LicenseGPL3*

Genre: Shmup

Theme: Sci-Fi

Pylaga

Clone of Galaga

Platforms:Windows

LicenseGPL2*

Genre: Action

Theme: Sci-Fi

Rafkill

Clone of Tyrian

Platforms:Windows

LicenseLGPL2*

Genre: Shmup

Theme: Sci-Fi

Raid 2020 (original game, not this project)

Original game image

Raid 2020 Source Code

Clone of Raid 2020

Platforms:NES

LicenseUnknown

Genre: Action

Theme: Sci-Fi

SkyRoads (original game, not this project)

Original game image

SkyRacer

Clone of SkyRoads

Platforms:TI calculator

LicenseUnknown

Genre: Platform

Theme: Sci-Fi

Space Glider

Clone of Starglider 2

Platforms:WindowsLinuxDOS

LicenseUnknown

Genre: Simulation

Theme: Sci-Fi

Space Opera

Clone of Galactic Civilizations

Platforms:WindowsLinuxOSX

LicenseGPL2*

Genre: Turn-Based Strategy

Theme: Sci-Fi

Original game image

Spacewar!

Clone of Spacewar!

Platforms:Web

LicenseUnknown

Genre: Action

Theme: Sci-Fi

Original game image

Speedball 2

Clone of Speedball 2

Platforms:Windows

LicenseUnknown

Genre: Action

Theme: Sci-Fi

Star Castle 2600

Clone of Star Castle

Platforms:Atari

LicenseUnknown

Genre: Shooter

Theme: Sci-Fi

Star Fire II

Clone of Star Fire

Platforms:Arcade

LicenseUnknown

Genre: shoot 'em up

Theme: Sci-Fi

Star Trek: New Worlds (original game, not this project)

Original game image

Star Trek New Worlds Source Code

Clone of Star Trek: New Worlds

Platforms:Windows

LicenseUnknown

Genre: Real-Time Strategy

Theme: Sci-Fi

Star Trek: Voyager – Elite Force (original game, not this project)

Original game image

Star Trek Voyager : Elite Force Single Player Game Source

Clone of Star Trek: Voyager – Elite Force

Platforms:Windows

LicenseUnknown

Genre: FPS

Theme: Sci-Fi

Star Wars (1983 arcade game) (original game, not this project)

Original game image

Star Wars: The Arcade Game Disassembly

Clone of Star Wars (1983 arcade game)

Platforms:Atari

LicenseUnknown

Genre: Arcade

Theme: Sci-Fi

Starquake (original game, not this project)

Original game image

Starquake disassembly

Clone of Starquake

Platforms:BBC Micro

LicenseUnknown

Genre: Action

Theme: Sci-Fi

Starship Command (original game, not this project)

Original game image

Starship Command disassembly

Clone of Starship Command

Platforms:BBC Micro

LicenseUnknown

Genre: Shooter

Theme: Sci-Fi

Starship Commander Disassembly

Clone of Starship Commander

Platforms:Apple II

LicenseUnknown

Genre: Turn-Based Strategy

Theme: Sci-Fi

Stellar Conquest 3: Hostile Takeover

Clone of Stellar Conquest 3: Hostile Takeover

Platforms:DOS

LicenseUnknown

Genre: Strategy

Theme: Sci-Fi

The Planet of Death

Clone of Adventure A: Planet of Death

Platforms:TI calculator

LicenseUnknown

Genre: Adventure

Theme: Sci-Fi

The Rush

Clone of Wipeout

Platforms:Windows

LicenseGPL2*

Genre: Racing

Theme: Sci-Fi

The Ur-Quan Masters

Clone of Star Control 2

Platforms:WindowsLinuxOSX

LicenseGPL2*

Genre: Adventure

Theme: Sci-Fi

Thrust

Clone of Thrust

Platforms:Linux

LicenseGPL2*

Genre: Arcade

Theme: Sci-Fi

Original game image

Trust & Betrayal

Clone of Trust & Betrayal: The Legacy of Siboot

Platforms:Classic Mac OS

LicenseUnknown

Genre: Educational

Theme: Sci-Fi

Mega Turrican (original game, not this project)

Original game image

Turrican III

Clone of Mega Turrican

Platforms:Amiga

LicenseUnknown

Genre: Platform

Theme: Sci-Fi

UFO2000

Clone of X-COM: UFO Defense

Platforms:WindowsLinux

LicenseGPL2*

Genre: Strategy

Theme: Horror

UFO: Alien Invasion

Clone of X-COM: UFO Defense

Platforms:WindowsLinuxOSX

LicenseGPL2*

Genre: Strategy

Theme: Horror

Uridium Advance + Paradroid (GBA Source and Builds)

Clone of Paradroid

Platforms:GBA

LicenseUnknown

Genre: Shmup

Theme: Fantasy

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