Star Trek Online - Star Trek Online (STO) is a free to play MMORPG that takes place inside the Star Trek world.
Elite Dangerous - Elite Dangerous is a 2015 Trading, Action, Sci-fi, Exploration, Open World and Space Simulation by Frontier Developments.
X3: Terran Conflict - X3: Terran Conflict is part of the X number of video games.
STAR WARS: EMPIRE AT WAR - STAR WARS: EMPIRE AT WAR is an Adventure, Strategy, Science-fiction, Real-time-strategy, Star Wars, Single and Multiplayer video game created by Petroglyph Games and published by LucasArts.
EVE Online - Player-created empires, player-driven markets, and endless ways to embark on your personal sci-fi adventure.
Kerbal Space Program - Build spacecraft, fly them, and try to help the Kerbals to fulfill their ultimate mission of conquering space.