Not a space sim, but heaps of fun game modes and great with a group of friends

Singleplayer spaceship simulator. fantastic, simplistic, unlockables not microtransactions... i dont know what to say, completely worth it.

This is a good space sim for 5 people. However, the lack of creative difference in the small team means the visuals and mechanics are lacking.

Voxel based, stylized physics space simulator. This game is fun with a group, and with the right mods you could make a great Role-play server.