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Giac/Xcas - Free computer algebra system
SciDaVis - SciDAVis is a free application for Scientific Data Analysis and Visualization.
GeoGebra CAS Calculator - Free online algebra calculator from GeoGebra: solve equations, expand and factor expressions, find derivatives and integrals
GnuPlot - Gnuplot is a portable command-line driven interactive data and function plotting utility.
Geometry Pad - Geometry Pad is a dynamic geometry application for iPad and Android tablets.
Matplotlib - matplotlib is a python 2D plotting library which produces publication quality figures in a variety...