Check out
Starshatter as well.
Its in closed beta at the moment (which im in, and its pretty damn good), but there is a download for the public release on the website.
It isnt as close to the developer version, but its good to see what to expect in the future.
Theres a promising looking B5 mod for Starshatter, but i havent downloaded it yet because its bigger than the game its a mod for