under construction
Open Babel: The Open Source Chemistry Toolbox:
http://openbabel.org/wiki/Main_Page
http://openbabel.org/wiki/Category:Installation
https://opensource.com/article/19/5/python-3-default-mac
https://apple.stackexchange.com/questions/103814/cant-plot-with-gnuplot-on-my-mac
https://ambermd.org/InstMacOS.php
Homebrew
Image magick
https://imagemagick.org/script/download.php
https://imagemagick.org/script/convert.php