Scaletron!
Need something to help you find out whether you are shrinking or enlarging a drawing properly? Then use Scaletron! This small and simple software for Mac works like an electronic version of the old graphic arts proportion wheel. It is perfect for figuring out the proper sizing for artworks, documents, and almost anything else you can think of.
One of the best mini softwares that artists, photographers, pre-press gurus or web designers can have in their arsenal.