Belight Software’s $15 Swift Publisher 4 (Mac App Store Link) brings powerful desktop publishing technologies to your Mac, and helps you create beautiful postcards, brochures, invitations, and newsletters.
The app works alongside OS X’s built-in apps like Pages and Photos, comes with a library of more than 1000 clipart images, and can export data to popular formats, including, of course, PDF.
Find out more by searching for it!