SpeedCrunch is great too, it was originally inspired by the WinXP PowerCalc - probably the best calculator from Microsoft: <a href="http:&#x2F;&#x2F;dan.hersam.com&#x2F;2010&#x2F;11&#x2F;10&#x2F;powercalc-in-windows-7&#x2F;" rel="nofollow">http:&#x2F;&#x2F;dan.hersam.com&#x2F;2010&#x2F;11&#x2F;10&#x2F;powercalc-in-windows-7&#x2F;</a> (SpeedCrunch still lacks the graph rendering part, though has other features and improvements)