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SpeedCrunch - SpeedCrunch. SpeedCrunch is a high-precision scientific calculator featuring a fast, keyboard-driven user interface. It is free and open-source software, licensed under the GPL. Download Documentation Donate .
NumWorks - The graphing calculator that makes learning math easier.
Qalculate! - Qalculate! is a multiplatform multi-purpose desktop calculator.
Learney - Knowledge aggregator for developers
Numi App - Numi is a beautiful text calculator for Mac.
eMathHelp.net - Site is created to help people learn math. Includes algebra, calculus, differential equation calculators and notes with many examples.