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Numi - Numi is a beautiful text calculator for Mac.
SpeedCrunch - SpeedCrunch. SpeedCrunch is a high-precision scientific calculator featuring a fast, keyboard-driven user interface. It is free and open-source software, licensed under the GPL. Download Documentation Donate .
Soulver - Soulver is a software application that functions as a calculator that allows you type a continuous stream of information rather than having to input data into multiple cells.
Gnome calculator - Calculator for the GNOME Desktop Environment, formerly known as gcalc (and gcalctool CLI).
galculator - galculator is an open source scientific calculator with a modern GUI and a wide range of operation modes. It supports algebraic, reverse polish (RPN) and paper mode notations.
RealCalc Scientific Calculator - RealCalc Scientific Calculator