No revenue estimate for GOG — its rating/review counts don't calibrate to sales the way Steam's do. The Steam version is estimated at $184K — a different platform, not this one.

Freespace 2

Freespace 2 includes the FRED2 editor available in the installation directory of the game. The year is 2367, thirty two years after the Great War. Or at least what YOU thought was the Great War. The seemingly endless tide of Shivan capital ships, bombers and fighters with super advanced technology was nearly overwhelming. As the Terran and Vasudan races finish rebuilding their decimated societies, a disturbance lurks in the not-so-far reaches of the Gamma Draconis system. Your nemesis has arrived... and they are wondering what happened to their scouting party...