ProKon is a calculator unlike any you've seen before. It features unit conversions of over 400,000 units, a pop-up scientific/financial/geometry calculator with tape, as well as many calculation modules covering a wide variety of topics.
Price: $24.95, Rating: 8, Downloads: 15
Download
ProKalc is a full featured scientific calculator featuring a scrolling tape and 15-digit accuracy. Integrated help through a unique hot-key interface.
Price: $19.00, Rating: 8, Downloads: 12
Download 