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
OriginLab - OriginLab is a data analysis tool that provide the engineers and scientist with the technical charts and system for 2D and 3D plotting and all kind of fitting including curve and peak fitting.
GNU Octave - GNU Octave is a programming language for scientific computing.
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.