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GnuPlot - Gnuplot is a portable command-line driven interactive data and function plotting utility.
Giac/Xcas - Free computer algebra system
GeoGebra - GeoGebra is free and multi-platform dynamic mathematics software for learning and teaching.
GeoGebra CAS Calculator - Free online algebra calculator from GeoGebra: solve equations, expand and factor expressions, find derivatives and integrals
SciDaVis - SciDAVis is a free application for Scientific Data Analysis and Visualization.
Geometry Pad - Geometry Pad is a dynamic geometry application for iPad and Android tablets.