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 Calculator.com
At this site, you get free access to a mind-boggling collection of free online calculators for every conceivable need. Calculators are included for the following categories: Agricultural, Automobile, Brewing, Clothing, College, Computing, Converters, Cooking, Design, Distance, Engineering, Finance, Fun, Health, Manufacturing, Numeric, Photography, Scientific, Sports and Time. Sure beats the old slide rule we had to use back in school!
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 Calc98
Here's a powerhouse free utility. A serious number cruncher, Calc98 is a scientific calculator with tons of features and loads of bells and whistles. It's free, but if you use it more than 90 days, the author would like you to register it (which is free). (For Windows)
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Super Calculator
Windows has a built-in calculator, but it's pretty lame. If you need more serious number-crunching capabilities, then check out this free program. It's a command line-style calculator that lets you run math expressions with your keyboard.
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Free Software