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GeoGebra Graphing Calculator - Interactive, free online graphing calculator from GeoGebra: graph functions, plot data, drag sliders, and much more!
GeoGebra CAS Calculator - Free online algebra calculator from GeoGebra: solve equations, expand and factor expressions, find derivatives and integrals
Giac/Xcas - Free computer algebra system
GnuPlot - Gnuplot is a portable command-line driven interactive data and function plotting utility.
Dr. Geo - Dr. Geo, a software to design & manipulate interactive geometric sketches.
Graphing Calculator - Visualize equations and functions in 2D, 3D and 4D.