Windows/Mac/Linux: Free, open source application KeyJnote transforms any simple PDF into a powerful interactive presentation similar to PowerPoint or Keynote. After you plug your PDF into KeyJnote, you get a slate of powerful presentation tools, with everything from simple forward and back navigation with your left and right mouse buttons, mouse highlighting, rectangle highlighting, slide zooming, and more. KeyJnote doesn’t yet have a graphical interface for starting a PDF presentation, but using it is simple.