Most apps now days are programed for PC, 32 and 64 bit platforms, there are some specifically for Mac but not many. Xyrus has an Apo version for Mac I believe, Mandelbulber may also I can't remember. I know a lot of folks at Fractal Forums run Mandelbulb3D on Mac's using WINE(Windows Emulator for MAC). UF has a Mac Version for sale.

Remember...No matter where you go there you are