application for cropping PDF files. A simple user interface lets you define exactly the crop-region by fitting a rectangle on the visually overlaid pages.
"Set Passwords and Infomation to PDF" can set User/Owner passwords and Tilte/Subject/Keyword/Author/Creator information to PDF file. It contains the command line tool 'pdfauxinfo' and 'Add Auxiliary Info to PDF' Automator action, and therefore it's for Mac OS X. Automator action uses command line internally.
calibre is a free and open source e-book library management application.
