Those are my favorite FPS games on the Mac right now, but if there are any other can't-miss shooters on your short list, let me know in the comments below. And it's free, so you have nothing to lose but some download bandwidth. Its graphics are quaint and primitive, its interface is awkward by modern standards, but it stands out as a period piece worthy of remembering and enjoying. Sure it would be preferable to get Windows 7, but, every game still runs on XP still as far as I know. You must descend into its innermost recesses, battling fearsome monsters to save the world. Not really, you can get a copy of Windows XP on eBay for around 60 bucks. The game traps you in a mysterious pyramid in the Yucatan that threatens the very survival of the Earth. Not 'freemium' - there are no in-app purchases you need to make to keep playing.

Man Up Time has resurrected this 20-year-old masterpiece for modern Mac and they've made it absolutely free. That game was called Pathways Into Darkness. Before Halo, before Myth, before Marathon, way back in 1993, Bungie Software made a name for itself with Mac gamers with one of the most innovative first person shooters we'd ever seen (and really, we hadn't seen a lot of them, but we knew this one was cool).

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