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Time.is - exact time in any location
Numi App - Numi is a beautiful text calculator for Mac.
World Time Buddy - Effortless time conversion and world 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.
timeanddate.com - Free Clock for your website or blog!
SymCalc - Symbolic Calculator - Math toolbox for iOS. Advanced calculator features with a tape-like history, not requiring internet...