Pioneer - Pioneer is a space adventure game set in the Milky Way galaxy at the turn of the 31st century.

Pioneer Scout Plus - A game of missions, trade and space combat in the 31st century using the Pioneer Space Sim engine...

EVE Online - Player-created empires, player-driven markets, and endless ways to embark on your personal sci-fi adventure.

Celestia - Real-time 3D visualization of space

Universe Sandbox - Universe Sandbox ² is a physics-based space simulator where you can simulate Events and even break physics and friction with certain features.

X - It is a science fiction space trading and combat simulator series.