Good news, Freespace is released for the Mac now on GOG.com, Click on the links mentioned here, create an account using the signup in the top bar on the GOG.com website and buy the game. You automatically get when creating an account 9 free GOG games added to your account (most of them also native for Mac so no port required) so you have nothing to loose, only to receive!
As a pilot for the Galactic Terran Alliance (GTA) you are no stranger to war. But when racing through space to engage your new enemy for the first time, you sense something different. Suddenly, darkness blankets your craft. Your stomach sinks as your eyes pan across the Shivan flagship’s massive body. Then it begins. Swarms of fighters pour from the belly of the flagship and scream towards you. You are about to discover everything you thought you knew about space combat just changed.