Here are some interesting softwares that are very useful for scientific publications (Please note that they are all free):
Simplex Numerica:
SimplexNumerica has been designed to make complicated numerical math, applied to big data analysis, in conjunction with an outstanding chart library, very simple. The evaluation of your measurement data will be getting simplified, enormously.
https://www.simplexnumerica.com/
Veusz – a scientific plotting package:
Veusz is a scientific plotting and graphing program with a graphical user interface, designed to produce publication-ready 2D and 3D plots. In addition it can be used as a module in Python for plotting. Veusz is multiplatform, running on Windows, Linux/Unix and macOS. It supports vector and bitmap output, including PDF, Postscript, SVG and EMF. Veusz is Free Software.
Gnuplot:
Gnuplot is a portable command-line driven graphing utility for Linux, OS/2, MS Windows, OSX, VMS, and many other platforms. The source code is copyrighted but freely distributed (i.e., you don’t have to pay for it). It was originally created to allow scientists and students to visualize mathematical functions and data interactively, but has grown to support many non-interactive uses such as web scripting. It is also used as a plotting engine by third-party applications like Octave. Gnuplot has been supported and under active development since 1986.
Scidavis:
SciDAVis is a user-friendly data analysis and visualization program primarily aimed at high-quality plotting of scientific data. It strives to combine an intuitive, easy-to-use graphical user interface with powerful features such as Python scriptability.
http://scidavis.sourceforge.net/about.html
