A Forth compiler with a little difference
RPNCalc - The command line Reverse Polish Notation (RPN) Calculator
Command-line calculator and libray.
Basic subnet calculator written in Python.
Powerful Calculus Environment and Matrices Handling Engine
Command-line calculator of basic statistics.
A simple Python utility to calculate file size from bitrate.
A pseudo-graphical calculator for FreeDOS (or any other DOS)
Zwicker's Loudness Calculation (ISO532B) Tools