Empyrion - Empyrion is a 3D open world, space survival adventure in which you can fly across space and land on...
Pioneer - Pioneer is a space adventure game set in the Milky Way galaxy at the turn of the 31st century.
Avorion - Explore, build, fight, trad and mine in a procedural co-op space sandbox.
X - It is a science fiction space trading and combat simulator series.
StarMade - StarMade is a Minecraft inspired 3D space shooter.
EVE Online - Player-created empires, player-driven markets, and endless ways to embark on your personal sci-fi adventure.