I don't know if it's been mentioned before, but a search of the forums didn't turn up anything, so here goes:
Kinetic void is a sandbox space simulator currently on Kickstarter. It's a game I'm quite excited about, but funding's not doing too well. It's got two key features that really attract me to it: firstly, it has a procedurally generated galaxy (with many factions, all with their own philosophies and politics) which means you can play a different game every time. Secondly, it allows you to design your own ships. The cool thing about the ship-building is that it's limited only by your resources, so as you do well in the game you can expand your fighter to a mighty capital ship. Get some allies, and where you were once limited to simple trade missions you now have the power to bring countries to their knees. You can give the game your own spin, and the progressive gameplay means the gameplay options expand with your character.
The game is currently in a pre-alpha state, but the shipbuilder demo is availablehere; the Kickstarter is here.
An interesting thing to note is that they're running a referral program. If someone who pledges at least $10 (which gets you the full game upon release) lists you as a referrer, your own pledge is bumped up by $10. So say you list me as the referrer upon pledging, the tier reward I'd get is my own pledge + $10 for each of you. So if the game looks good to you, spread the word. Naturally, this post is made entirely without any financial interest on my part.