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WolframAlpha - WolframAlpha brings expert-level knowledge and capabilities to the broadest possible range of people—spanning all professions and education levels.
GnuPlot - Gnuplot is a portable command-line driven interactive data and function plotting utility.
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 .
GeoGebra - GeoGebra is free and multi-platform dynamic mathematics software for learning and teaching.
Numi App - Numi is a beautiful text calculator for Mac.
Grapher - Put Grapher’s powerful graphing and data analysis features to the test and better understand your data. Learn about features and download a free trial.