Numi App - Numi is a beautiful text calculator for Mac.
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.
Soulver 3 for Mac - A smart notepad with a built in calculator
Parsify Desktop - Extendable calculator for the 21st century ⚡
Caligator - An open-source calculator & convertor that thinks like you
MyScript Calculator - Perform mathematical operations naturally using your handwriting.