X3: Terran Conflict - X3: Terran Conflict is part of the X number of video games.
EVE Online - Player-created empires, player-driven markets, and endless ways to embark on your personal sci-fi adventure.
Wing Commander: Privateer - Wing Commander: Privateer is a space simulator and adventure game that allows you to build your own story in this dog eat dog universe.
Elite Dangerous - Elite Dangerous is a 2015 Trading, Action, Sci-fi, Exploration, Open World and Space Simulation by Frontier Developments.
X Rebirth - X Rebirth is an Action-Adventure, Sci-fi, Open World, Sandbox, Trading, Strategy, Space and Single player Simulation created and developed by Egosoft.
Frontier: Elite II - Frontier: Elite II is an Amazing, Action-Adventure, Space Trading, Single-player and Combat Simulator developed by David Braben, Frontier and published by Gametek, Konami.