Free games by keyword: science fiction
Play games defined by keyword: "science fiction".
GAME SETTING - Exploration in deep space, mech battles, cyberpunk lovestories, UFO invasions. Every theme even remotely tied to science fiction has been implemented in a video game one way or another. Free games make no exception; from Star Trek to Star Wars, developers still draw much inspiration from sci-fi.

Hyper Princess Pitch
shooter / shoot 'em up
WindowsDaniel Remar

EVE Online
MMO / MMORPG
Windows, Mac OSXCCP Games

Digital: A Love Story
adventure / visual novel
Windows, Linux, Mac OSXChristine Love

The Ur-Quan Masters
strategy / space exploration
Windows, Linux, Mac OSX, Amiga, Android, iOSToys For Bob

Ascii Sector
simulation / space exploration
Windows, Linux, Mac OSXLaserbrain Studios

Beneath a Steel Sky
adventure / point & click
DOS, Amiga, Windows, UNIXRevolution Software

Hero Core
shooter / metroidvania
Windows, Mac OSXDaniel Remar

The Lost Vikings
platform / action puzzle
DOSInterplay Productions

One Must Fall: 2097
action / fighting games
DOSDiversions Entertainment

Star Wars: The Old Republic
MMO / MMORPG
WindowsBioWare

Tyrian 2000
shooter / shoot 'em up
Windows, DOS, Mac OSXEclipse Productions

Warframe
shooter / MMOFPS
Windows, PlayStation 4, Xbox One, Nintendo SwitchDigital Extremes

Alien Arena
shooter / first-person shooter
Windows, Linux, Mac OSXCOR Entertainment

Computer, Open That Door!
puzzle
Windows, Linux, Mac OSXPaul Lawitzki and Ralf Zimmer

Prospector
simulation / space exploration
Windows, LinuxMatthias Mennel

Worlds of Ultima: The Savage Empire
RPG / old school RPG
Windows, Mac OSX, DOSOrigin Systems

Distorted Travesty 2
platform
WindowsZephyrBurst

Hydorah
shooter / shoot 'em up
WindowsLocomalito

StarCraft Anthology
strategy / real-time strategy
Windows, Mac OSXBlizzard

Hurrican
platform / run and gun
WindowsPoke53280