ProKalc is a full-featured scientific/financial calculator with scrolling tape. Using a point-and-click interface, you enter data for trig, exponential, scientific, and amortization problems and get immediate answers, with your input reviewable on tape. You can print results to the Clipboard, a file, or a printer. Ten memory locations, online context-sensitive help, and pop-up work screens for complex calculations.

ProKon is an impressive engineering units conversion utility for Windows 95/98/ME/NT/2000/XP. It supports over 400,000 conversions, in 26 different categories, both to and from the SI (metric), Imperial (English), and U.S. Customary systems. Many specialized calculation modules are included covering a wide variety of engineering and business topics. A pop-up scientific/financial/geometry calculator with tape is included.