Numi App - Numi is a beautiful text calculator for Mac.
Omni Calculator - Helping you make rational decisions, one calculation at a time.
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 ⚡
Startup Growth Calculator - Calculate how much x% growth at a startup REALLY means