Rule of 3 Calculator - Apply the mathematical Rule of Three in an easier, faster and more practical way!
Numi App - Numi is a beautiful text calculator for Mac.
Calculator OSX App - Real 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.
Real Time Calculator - A practical browser calculator that outputs results in real time!
Soulver 3 for Mac - A smart notepad with a built in calculator