A Forth compiler with a little difference
Scientific/engineering firmware repurposing HP business calculators!
An HP RPN calculator with interval output
Simple RPN desktop calculator, implemented with wxWidgets and Lua.
ultimative units calculation and conversion tool and library
Rpn calculator, string and macro based
galculator is a scientific calculator in algebraic mode and RPN
RPN based calculator in C#.
RPN calculator running on Windows and Linux