The WarpCalc calculator package contains two scientific calculators, one for the command line (CLI) and one for the OS/2 Presentation Manager (GUI). Both versions share the same core capabilities.
A whole calculation can be entered, reviewed and edited at once.
Plenty of standard mathematical functions built-in.
Seamlessly expandable with user defined variables and functions.
Temporary variables can be created on-the-fly using the assignment operator.
User configurable result formatting (e.g. engineering notation) and precision (upto 15 significant digits).
http://www.visdom.nu/software/warpcalc/index.html
Source: