The two Freespace games are my favourite space shooters. There are excellent mods to be had for Freespace 2, as Volition released the source code only a couple of years after its release - despite being critically well-received, it was a commercial failure. I got Freespace 2 from GOG a little while ago and there was also an article on GOG about all the mods, containing a link to an application that downloads and installs loads of mods to bring the graphics up to date, as well as loads of missions.
Soon you will have forgotten all things: soon all things will have forgotten you. (Marcus Aurelius, Meditations, Book 7)