TimeLeft - TimeLeft is a versatile desktop utility - it can be used as a countdown clock, reminder, clock...
Numi App - Numi is a beautiful text calculator for Mac.
XNote Stopwatch - Try the most feature-rich stopwatch and timer software on the net for free!
SymCalc - Symbolic Calculator - Math toolbox for iOS. Advanced calculator features with a tape-like history, not requiring internet...
Hourglass - Hourglass is the most advanced simple countdown timer for Windows.
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.