Quixotic Games is looking to bring you some new expansions for Core Worlds. They have both their Empires and Nemesis sets up on Kickstarter now. Empires is a stand-alone sequel, while Nemesis turns the original game into a solo-possible game. Good for times when no other gamers might be around.
From the campaign:
The campaign's really close to its funding goal with 9 days to go.