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.
DarkStar One - DarkStar One is targeted on space trading and combat.
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.
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.