Calculator++ - Calculator++ is an advanced, modern and easy to use scientific calculator.
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.
RealCalc Scientific Calculator - RealCalc Scientific Calculator
Numi App - Numi is a beautiful text calculator for Mac.
Parsify Desktop - Extendable calculator for the 21st century ⚡
Caligator - An open-source calculator & convertor that thinks like you