LeanCalc - This is a Cocoa calculator program based on the calc library.
  1.55 MB | Mac OS X 10.1 or later | GPL

This is a Cocoa calculator program based on the calc library. I wrote it because I thought the world needed yet another calculator program :-)

Thanks to calc’s large built-in function library LeanCalc can be used for simple arithmetic as well as complex calculations.

All calculations are kept in a history and you can reuse the results of the last few calculations in the history directly using keyboard shortcuts.