Abandonware DOS title

The best science fiction games

Time travel, space wars, alien empires, alternate universe, cyberpunk anti-heroes, space invaders, post-apocalyptic worlds, dystopian societies, mad scientists, galaxies far far away, strange new worlds, mech battles, deep space exploration, evil robots... should I go on?
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Space 1889

DOS19903.6/5 Paragon Software
Space 1889 is an abandoned top down RPG developed by Paragon Software and released in 1990 for DOS, Atari ST and Amiga. Space 1889 setting is classic science fiction, but is set in the Victorian. It's worth noting that Space 1889 is loosely based on the tabletop game of the same name.
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The Invaders

DOSWindows XP/98/951989remake3.6/5
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Zeitgeist

Windows XP/98/9519963.6/5 Taito
Zeitgeist, also known as Jupiter Strike in North America, is a 3D space shooter developed by Taito and published by Acclaim Entertainment. It was released for the PlayStation and Windows in 1996. Zeitgeist is a rail shooter: the player controls a spaceship that moves along a fixed path, with limited control over the ship's movement within...
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Sentinel Returns

Windows XP/98/9519983.6/5 Hookstone
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Command Adventures: Starship

DOS19953.6/5 Future Vision
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Fox Ranger

DOS19923.6/5 Soft Action
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Ikari Warriors 2: Victory Road

DOS19883.6/5 SNK Corporation
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Star Trek: First Contact

DOS19883.6/5 Simon & Schuster Interactive
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Thexder

DOS19873.6/5 Game Arts
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CyberRace

DOS19933.6/5 Cyberdreams
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Essex

DOS19853.6/5 Synapse Software
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When Two Worlds War

DOS19933.6/5 Impressions Games
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Mines of Titan

DOS19893.6/5 Westwood Studios
Mines of Titan (also known as Mars Saga for other platforms) is an abandoned single-player RPG with a sci-fi setting (you're going to Mars!). Mines of Titan was developed by Westwood Studios and released by Infocom in 1989 for DOS, Apple II and Commodore 64.
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Meteors

DOS19893.6/5 Apogee Software
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Strider

DOS19893.6/5 Capcom
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Space Invaders 2001

Windows XP/98/952001remake3.6/5
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Astrotit

DOS1987NSFW3.5/5 Rudeware
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Interpose

DOS19963.5/5 Twilight Zone Software
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In Extremis

DOS19933.5/5 Blue sphere
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Buck Rogers: Planet of Zoom

DOS19843.5/5 Sega
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Amok

DOS19963.5/5 Scavenger
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Millennia: Altered Destinies

DOS19953.5/5 Take-Two Interactive
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Decker

Windows2002freeware3.5/5
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Guardians of Infinity: to Save Kennedy

DOS1988protected3.5/5 Paragon Software
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Kaeon

DOS19923.5/5
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Last Duel: Inter Planet War 2012

DOS19893.5/5 Capcom
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Lightspeed

DOS19903.5/5 MicroProse Software
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Nightlong: Union City Conspiracy

Windows XP/98/9519983.5/5 Trecision
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Phantis

DOS19873.5/5 Dinamic Multimedia