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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WING

Clone of Galaga

Platforms:WindowsLinuxDOS

LicenseGPL2*

Genre: Action

Theme: Sci-Fi

Original game image

Wipeout

Clone of Wipeout

Platforms:PS

LicenseUnknown

Genre: Racing

Theme: Sci-Fi

X-Force: Fight For Destiny

Clone of X-COM: UFO Defense

Platforms:Windows

LicenseGPL2*

Genre: Strategy

Theme: Horror

Original game image

XGalaga

Clone of Galaga

Platforms:Linux

LicenseGPL2*

Genre: Action

Theme: Sci-Fi

XGalaga++

Clone of Galaga

Platforms:LinuxOSX

LicenseGPL2*

Genre: Action

Theme: Sci-Fi

ZDoom

Clone of Doom

Platforms:WindowsLinuxOSX

LicenseBSD*

Genre: FPS

Theme: Sci-Fi

Original game image

Zandronum

Clone of Doom

Platforms:WindowsLinuxOSX

LicenseUnknown

Genre: FPS

Theme: Sci-Fi

Zed Online

Clone of Z

Platforms:Windows

LicenseGPL3*

Genre: Real-Time Strategy

Theme: Sci-Fi

Zod Engine

Clone of Z

Platforms:WindowsLinux

LicenseGPL3*

Genre: Real-Time Strategy

Theme: Sci-Fi

glFFE

Clone of Elite III

Platforms:Windows

LicenseUnknown

Genre: Action

Theme: Sci-Fi

miscom

Clone of Missile Command

Platforms:Linux

LicenseGPL2*

Genre: Arcade

Theme: Sci-Fi

Original game image

reone

Clone of Star Wars: Knights of the Old Republic

Platforms:WindowsLinuxOSX

LicenseGPL3*

Genre: RPG

Theme: Sci-Fi

Original game image

spacewar-sdl

Clone of Spacewar!

Platforms:WindowsLinux

LicenseGPL2*

Genre: Action

Theme: Sci-Fi

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xspacewarp

Clone of Space Warp

Platforms:Linux

LicenseUnknown

Genre: —

Theme: Sci-Fi

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