Calculator sites

It used to be an interesting challenge finding an accurate and reliable scientific calculator on a Mac. Now the one supplied (ie "Calculator") does have a scientific mode, as well as programmer mode, unit conversions, RPN, paper tape, and even speech.
There are still plenty of specialised calculators to find on the Web. I think every budding programmer must make a calculator at some point. Many are very good (and often they are free). Here are some of my favourites:

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http://www.calculatoredge.com/index.htm has a large collection of Physics and other online calculators.


Unit Converters:
http://www.aqua-calc.com/ has volume calculators and other converters.

BalancePro

iUnit OSX


Geometry Calculators

GeoCalc

Geometry X



Base Converters:

Haxor

Boolean Calculator




Bill Bowden has some Electronics calculators at http://www.bowdenshobbycircuits.info/. Scroll down on the main page to find them.



Music Calculators:

Music Calculator

MusiCalc

Music Math



Speaker Designer Calculators:

http://www.diyaudioandvideo.com/
http://www.the12volt.com/info/diagrams.asp



Media Calculators:

Media Calculator 3

MovieCal