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MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming
GnuPlot - Gnuplot is a portable command-line driven interactive data and function plotting utility.
GNU Octave - GNU Octave is a programming language for scientific computing.
GeoGebra CAS Calculator - Free online algebra calculator from GeoGebra: solve equations, expand and factor expressions, find derivatives and integrals
Wolfram Mathematica - Mathematica has characterized the cutting edge in specialized processing—and gave the chief calculation environment to a large number of pioneers, instructors, understudies, and others around the globe.
Maxima - Maxima is a fairly complete computer algebra system written in Lisp with an emphasis on symbolic computation.