Freecalc

The Windows Calculator is a very useful utility but also quite limited beyond simple sums.

Moffsoft Freecalc is a replacement with several extra features that make it very useful.

Installation is simple and it doesn't look that much different from the standard calculator. The most obvious difference is the tape roll (or electronic equivalent at least) on the right-hand side of the window. This shows all of the inputs for the calculations and is useful for checking for mistakes.

The other obvious change is that the contents of the memory is shown in the Status bar. Again more useful for keeping track of what's going on.

Other changes include double and tripe zero buttons.