You don’t hear much talk of Bungie’s titles before they made the Halo series. But before Halo, Bungie had another first person science fiction shooter called Marathon in 1994 that was a Mac exclusive.
It looks like the old franchise might be making a return in some form though. Bungie recently trademarked Marathon.
If anything ever sees the light of day from the Marathon franchise, it can be pretty much anything at this point – a straight port, a remake, or a new entry.