I have the X-Com collector's edition, which includes WINDOWS versions of X-Com, Terror from the Deep, and Apocalypse.
So far I have been unable to get these games to run, but I'll try to play with it and see if I can develop some workarounds.
I know that the dos versions will work on DosBox (and dosbox has a Mac version). I also know that the steam versions of these games are listed differently, and have different results in crossover games.
Since I have the collector's edition, I might play with that for a while to see if I can get it to work.