DuplicatePhotoSearch 2.0.6 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The program lies within System Tools, more precisely System Optimization. We recommend checking the downloaded files with any free antivirus. This Mac application was originally created by Islandbit Inc.
From the developer:
DuplicatePhotoSearch is designed to help you identify copies of photos on the hard drive of your Mac. Once identified, you have the option to move the photos you select to the Trash (where they can be recovered if needed), view them in Finder, or open them using your system's default application.
You may want to check out more Mac applications, such as Dock Delight, Snow Checker or SBSystemPrefs, which might be similar to DuplicatePhotoSearch.