Qalculate! - Qalculate! is a multiplatform multi-purpose desktop calculator.
MathCrunch - Learn math stress free
SpeQ Mathematics - SpeQ is a small, extensive mathematics program with a simple, intuitive interface.
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NumWorks - The graphing calculator that makes learning math easier.
eMathHelp.net - Site is created to help people learn math. Includes algebra, calculus, differential equation calculators and notes with many examples.