Image Viewer
http://planetozh.com/projects/lightbox-clones/
http://lokeshdhakar.com/projects/lightbox2/
http://www.digitalia.be/software/slimbox2/
CSS Popup Image Viewer
CSS Popup Image Tutorial
https://www.macinchem.org/applescript/imagemagick.php
Converters
https://websemantics.uk/tools/image-to-data-uri-converter/