PDFTK Builder - PDFTK Builder is a free graphical interface to for PDFTK, making it much easier to use.
MerlinOne - MerlinOne offers digital asset management software solutions news to media, non-profits, universities, government and corporations.
QPDF - QPDF is a command-line program that does structural, content-preserving transformations on PDF...
Brandfolder - One link to all your marketing assets. Brandfolder is your convenient source to visually organize, quickly find and easily share all your final brand assets.
iSafePDF - iSafePDF is a free open source PDF protection software.
Canto - Canto is an Atom/RSS feed reader for the console that is meant to be quick, concise, and colorful.