Skim is a PDF reader and note-taker for OS X. It is designed to help you read and annotate scientific papers in PDF, but is also great for viewing any PDF file. * Viewing PDFs * Adding and editing notes * Highlighting important text * Making "snapshots" for easy reference * Navigation using table of contents or thumbnails * View all your notes and highlights * Convenient reading in full screen * Giving powerful presentations * Handy preview of internal links * Focus using a reading bar * Magnification tool * Extensive AppleScript support * Bookmarks * Support for Apple Remote Control * Interaction with LaTeX and PDFSync * Spotlight support * Highly customizable * And much more...