ProKalc

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,
pop-up work screens for complex calculations,
and 15-digit accuracy without rounding errors
make ProKalc a winner.