Games like Starship Traveller (Standalone)
Games like Starship Traveller (Standalone) include Roadwarden, Starfield, Rebel Galaxy, Starcom: Nexus, and The Expanse: A Telltale Series. We matched them by the tags players give Starship Traveller (Standalone) on Steam (Adventure, RPG, Indie, Choose Your Own Adventure, and Space): closest matches first, and among equally close ones the better-known games.

Roadwarden
Shared: RPG · Adventure · Indie

Starfield
Shared: RPG · Space · Sci-fi

Rebel Galaxy
Shared: RPG · Space · Adventure

Starcom: Nexus
Shared: RPG · Space · Adventure

The Expanse: A Telltale Series
Shared: Adventure · RPG · Choose Your Own Adventure

The Life and Suffering of Sir Brante
Shared: RPG · Choose Your Own Adventure · Interactive Fiction

STAR WARS™ Knights of the Old Republic™
Shared: RPG · Adventure · Sci-fi

To the Moon
Shared: Indie · Adventure · RPG

Deliver Us The Moon
Shared: Adventure · Indie · Space

No Man's Sky
Shared: Space · Adventure · Sci-fi

Warhammer 40,000: Inquisitor - Martyr
Shared: RPG · Adventure · Indie

Observation
Shared: Adventure · Indie · Space

Between the Stars
Shared: RPG · Space · Indie

Outer Wilds
Shared: Adventure · Space · Indie

Aliya: Timelink
Shared: RPG · Interactive Fiction · Space

Citizen Sleeper
Shared: RPG · Sci-fi · Interactive Fiction

Space Rangers HD: A War Apart
Shared: RPG · Adventure · Space

Endless Sky
Shared: Space · Adventure · Sci-fi

WILL: A Wonderful World / WILL:美好世界
Shared: RPG · Adventure · Indie

Space Pirates And Zombies 2
Shared: Space · Indie · RPG

Mass Effect (2007)
Shared: RPG · Sci-fi · Space

FTL: Faster Than Light
Shared: Space · Indie · Sci-fi

STAR WARS™ Knights of the Old Republic™ II - The Sith Lords™
Shared: RPG · Sci-fi · Adventure

Star Trek Online
Shared: RPG · Sci-fi · Space