http://priv.solsector.net/announcements.htm
Privateer Remake, free/open source. Havn't tried it yet, but if its anything like the original Privateer, I'm going to love it.
I can hear the Retros already; "Die, by the very weapons you adore!". Its been so many years since I played it, but I can still remember so much of it so clearly.
Game summary for the lazy:
Get missions, buy ships/upgrades, do story campaign missions ounce in a while. Open-ended, can potentially be a bounty hunter, pirate or merchant. Based off of the Wing Commander universe.