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.
Equity Calculator - Figure out what your equity is worth
SymCalc - Symbolic Calculator - Math toolbox for iOS. Advanced calculator features with a tape-like history, not requiring internet...
Startup Equity Calculator - Figure out how much equity to grant new hires in seconds.