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.
Numbr - An elegant calculator for the web
Soulver 3 for Mac - A smart notepad with a built in calculator
Numi App - Numi is a beautiful text calculator for Mac.
Pry Financials - Finance for Founders