Star Citizen is a new imagining of online games. You can do so many different things: Fly ships for trading, combat, or just tour around. You can engage in PVP or PVE situations with missions and player driven content. Star Citizen is still an Alpha so things can be buggy and change about once a quarter. PTU = Persistant Test Universe ... https://www.youtube.com/watch?v=aTEJIbI1Uvg
Foundation is an early access game available on Steam. Foundation is a grid-less, sprawling medieval city building simulation with a heavy focus on organic development, monument construction and resource management.
Link to Steam store page:
https://store.steampowered.com/app/690830/Foundation/