Fancybox - fancyapps.com - Fancy App Store
PDFTK Builder - PDFTK Builder is a free graphical interface to for PDFTK, making it much easier to use.
Magnific Popup - The greater part of Lightbox modules will completely preload a picture before showing it.
QPDF - QPDF is a command-line program that does structural, content-preserving transformations on PDF...
PhotoSwipe - JavaScript gallery, no dependencies.
PyPDF2 - PyPDF2 - A utility to read and write pdfs with Python