MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming

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.

GnuPlot - Gnuplot is a portable command-line driven interactive data and function plotting utility.

Maxima - Maxima is a fairly complete computer algebra system written in Lisp with an emphasis on symbolic computation.

PTC Mathcad - PTC Mathcad PTC Mathcad is Engineering Math Software That Allows You to Perform, Analyze, and Share Your Most Vital Calculations.

GeoGebra - GeoGebra is free and multi-platform dynamic mathematics software for learning and teaching.