steam calculator

Graphing scientific calculator.

RPN calculator library for REALbasic.

Multi-precision RPN calculator.

SpeedCrunch is a fast, high precision and powerful desktop calculator.

PEMDAS is a Scientific calculator (was Formulas, was Equations).

Cocoa calculator program based on the calc library.

Ratiochinator is a calculator uses Chinese characters.

Financial markup calculator.

Wcalc is a very capable calculator.

PEMDAS Widget is a scientific calculator.