Git

https://git-scm.com

Python

https://www.realpython.com

https://www.learnpython.org

https://www.python-engineer.com

https://docs.python-guide.org

https://pythonnumericalmethods.berkeley.edu

https://personal.math.ubc.ca/~pwalls/math-python/

Machine Learning

https://github.com/python-engineer/ml-study-plan

Code_Aster

https://www.code-aster.org/

https://code-aster-windows.com

https://wiki.osarch.org/index.php?title=Learning_Material_for_Code_Aster_and_Salome_Meca

https://feaforall.com

http://www.caelinux.org/wiki/index.php/Doc:Code-Aster

FEM

https://fenicsproject.org/

https://jsdokken.com/tutorials.html

https://steriva.github.io/FEniCSx-tutorials/intro.html

https://bleyerj.github.io/comet-fenicsx/index.html

https://defelement.com

Gmsh

http://gmsh.info/

UNIX

http://www.ee.surrey.ac.uk/Teaching/Unix/index.html

https://www.tutorialspoint.com/unix/index.htm

Shell Script

https://www.shellscript.sh

https://flaviocopes.com/bash-scripting/

https://bash.cyberciti.biz/guide/Main_Page

https://www.gnu.org/software/bash/manual/

Fortran

http://fortranwiki.org

https://fortran-lang.org

Gnuplot

http://www.gnuplot.info

http://www.gnuplotting.org

SPARSKIT

https://www-users.cs.umn.edu/~saad/software/SPARSKIT/

Textbooks

Math: https://tutorial.math.lamar.edu/

Continuum Mechanics: https://www.continuummechanics.org

Solid Mechanics: http://homepages.engineering.auckland.ac.nz/~pkel015/SolidMechanicsBooks/index.html

Etc.

John Burkardt's Home Page: https://people.sc.fsu.edu/~jburkardt/

Global Symbols: https://globalsymbols.com

PNGWave: https://www.pngwave.com

FFmpeg (Multimedia framework): https://ffmpeg.org/

GIF from a video: https://www.thewindowsclub.com/how-to-create-animated-gif-from-a-video-file-using-vlc-and-gimp

Engauge Digitizer (Data from images): http://markummitchell.github.io/engauge-digitizer/