Osiris: New Dawn has been floating around the games scene for a little while now, but it's now available to play via Steam Early Access.
We've been waiting to cover this title until we were sure about its co-op features, and our inquiries have been answered: there will be PvE only servers available. The servers aren't up just yet, but should be live within the next couple of weeks. When they do go up, you and your friends will be free to build your space colony and fend off the dangers and horrors of the universe. For now, if you're interested in checking it out, you can just make a private server for friends only.
Osiris: New Dawn is available via Steam Early Access for $24.99. The game will support a total of 12 players online who work together to build a space colony within the Gliese 581 system and survive the perils that lurk there.