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GeoGebra - GeoGebra is free and multi-platform dynamic mathematics software for learning and teaching.

GnuPlot - Gnuplot is a portable command-line driven interactive data and function plotting utility.

Desmos - A beautiful, innovative, and modern online graphing calculator.

MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming

WolframAlpha - WolframAlpha brings expert-level knowledge and capabilities to the broadest possible range of people—spanning all professions and education levels.