Freelancer was (and still is) a fantastic little game. Accessible, easy to play, but still managed to feel like a giant galaxy that you could explore forever and still keep finding new things. Some of the more difficult to find systems were pretty impressive. Sure it was a little simplistic in some ways, but for a quick blast of space fun without needing to master accountancy, it was excellent. NB: I've never actually played the X games yet despite having them sitting in my Steam account, so the accountancy comment may be a complete inaccuracy, but it's certainly the impression I get.
Getting difficult to find Freelancer now, I wish Steam or similar would pick it up, just as a backup option in case I ever lose my disk.