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Simple menu bar calculator.

Graphing scientific calculator.

RPN calculator library for REALbasic.

Multi-precision RPN calculator.

Speakerphone, notebook, calculator, calendar, clip collector and more.

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.