Calc
Calc: arbitrary precision calculator
Calc is an interactive calculator which provides for easy large numeric calculations, but which also can be easily programmed for difficult or long calculations. It can accept a command line argument, in which case it executes that single command and exits. Otherwise, it enters interactive mode. There are a great number of pre-defined functions. The calculator can calculate transcendental functions, and accept and display numbers in real or exponential format. The calculator also knows about complex numbers.
Office
http://gnuwin32.sourceforge.net/packages/calc.htm