I decided to take a shot at all of Roger's (plan b) software which would be the combo Vinyl & Inkjet estimator, as well as the free Shop Time estimator he offers. All of these apps work perfectly on the Mac OS platform! I'm running Mac OS X Tiger to be exact and did not have one hiccup.
I was able to plug in numbers and even print the estimates which is very helpful to new users like myself. Some of the items in the estimators I never thought to factor into jobs. Therefore, if you're a Mac user, you're good to go with these apps too just like the Windows PC users!

Roger, you've done a great job with these apps.
You can find Roger's software at:
Brinkman's Heatpress Transfer estimator
AB