Download of Diptic 2.0.4 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This Mac app is an intellectual property of Peak Systems. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. The application lies within Design & Photo Tools, more precisely Viewers & Editors.
From the developer:
Note: This is an iOS app, you can find the Mac app here:Diptic for Mac
Diptic helps you easily combine multiple photos and apply artistic effects to create exceptional photo collages that can be shared with friends and family via email, Facebook, Twitter, Flickr, Tumblr or Posterous. With rounded borders, 52 customizable layouts and color effects, there are unlimited options to create unique images!
You may want to check out more software for Mac, such as Labels & Addresses, LiveQuartz Photo Edit or Prizmo, which might be similar to Diptic.