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.
Dr. Geo - Dr. Geo, a software to design & manipulate interactive geometric sketches.
LabPlot - LabPlot is a KDE-application for interactive graphing and analysis of scientific data.
Giac/Xcas - Free computer algebra system
Matplotlib - matplotlib is a python 2D plotting library which produces publication quality figures in a variety...