A simulation game where you build a city in the stars for humans and aliens as they go about their lives.
The pre-release version of the game is currently available via Steam’s Early Access programme.
Spacebase DF-9 Preview for Mac OS X
In Spacebase DF-9, you get to build a home in deep space for a growing number of would-be colonists. It's trying to capture the imagination of players in the same way that The Sims, or Dwarf Fortress does. It's still in development, meaning things are still to be added or changed before release, but it's also ready to play through Steam's Early Access programme, so the developers are (in theory at least) also open to feedback from the community. It's made by the comedians slash game-makers at Double Fine, and it has derelict spacecraft, mining, a social network, and space chickens.