Scilab is recommended for engineers, scientists, and educators who require a powerful computational tool without the associated costs of commercial software. It is also suitable for students and researchers who are looking to perform complex mathematical modeling and simulations.
SciDaVis - SciDAVis is a free application for Scientific Data Analysis and Visualization.
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming
LabPlot - LabPlot is a KDE-application for interactive graphing and analysis of scientific data.
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.
GNU Octave - GNU Octave is a programming language for scientific computing.