Freespace... wow, there's a blast from the past... that game is about 10 years old now, so if you are looking for a game that is similar in gameplay and graphics, Freespace ain't it. It's in the same class as games like "X-Wing vs. Tie Fighter" and "Wing Commander". Definitely a good game, though.
If you are into the whole MMO scene, there are a few options that might meet your needs. Eve Online is somewhat similar to Freelancer, though it did remind me of X2/X3 in terms of the learning curve required. There are also a couple MMO games that I haven't tried myself, but I've heard are quite similar to Freelancer; one is called Jumpgate and the other is called Allegiance.