The 1.0.3 version of Riffle for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The software lies within Design & Photo Tools, more precisely Viewers & Editors. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. This Mac application was originally created by bergdesign inc.
From the developer:
Riffle is an elegantly simple image browser designed to quickly "riffle” through images to find the ones you want. Drop files and folders onto Riffle and then scrub through images as fast as your Mac can read and display their content. You can even export a PDF catalog for future reference or to share with someone else.
You may want to check out more software for Mac, such as Vectorworks 2010 Viewer, DropImageURL or Polaris, which might be similar to Riffle.