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Think Digit Toolbar
A Firefox add-on that lets you quickly browse the Think Digit Forum from the current webpage...
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UPC Check Digit
UPC Check Digit - Easily calculate the check digit for UPC codes...
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Single Digit Multiplication
A small multiplication quiz written in Java...
Brutal Squirrel
A free converter to hex digits and back...
ISBN Calculator
Calculates the tenth digit of an ISBN automatically....
DigitalDigit
Java library to view digital digits...