BigFishGames currently sells a Mac version of the first game (and will soon have a Mac version of Clutter II: He Said, She Said). Eventually all the Clutter games will be sold for the Mac on BigFishGames.
I will also eventually sell the Mac games directly here but I’m not sure when yet.
Hopefully next year (2016), I will get a Unity version of Clutter that will run on all iPads and Tablets. This will become a priority after “Sliders and Other Square Jigsaw Puzzles” and “Clutter VI: Clutter Chaos” ships.