There are several FT programs for the Macintosh, the only one I have experience of is Heredis which I used on my Windows PC until they switched exclusively to the Mac. It was very good and easy to use, but they stopped supporting/updating the PC version so I now use RootsMagic.
I don't think there is a version of FTM for the Mac, but whatever program you get should happily import GEDCOMs created on your PC