Star Citizen!

EVE Online is a massive multiplayer online game that offers limitless potential to discover, explore and conquer an amazing science fiction universe where you pilot spaceships, fight, trade, and form corporations and alliances with other players.

No Man's Sky is a procedurally generated open universe game.

Elite: Dangerous is a space adventure, trading, and combat simulator that is the fourth release in the Elite video game series. Piloting a spaceship, the player explores a realistic 1:1 scale open world galaxy based on the real Milky Way, with the gameplay being open-ended. The game is the first in the series to attempt to feature massively multiplayer gameplay, with players' actions affecting the narrative story of the game's persistent universe, while also retaining single player options. It is the sequel to Frontier: First Encounters, the third game in the Elite series, released in 1995. »

Star Conflict is an action-packed, massively multiplayer space simulation game that puts players in the role of elite pilots engaging in a widespread interplanetary skirmish. The whole world for PVP and PVE!

There are fifty-four star systems in the X Universe, and within each one there are numerous installations. There is at least one space station in each system, and they range from ordinary factories like solar power plants to shipyards. By trading with them the player makes a profit, which allows one to upgrade the X-Perimental Shuttle with new weapons, better shields, and increased cargo space.

X Rebirth incorporates open-ended (or "sandbox") gameplay. As with previous installments in the series the game will take place in a universe that is active even when the player is not present, involving simulated trade, combat, piracy, and other features. The player as an individual may take part in these or other actions to gain notoriety or wealth, going so far as to be able to construct their own space installations and command fleets of starships, establishing what amounts to their own personal empire and dynamically and drastically altering the game world in the process. »