Download of ExifTool 10.1 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. The actual developer of this free Mac application is Phil Harvey. The software lies within System Tools, more precisely File Managers.
From the developer:
ExifTool is a platform-independent Perl library plus a command-line application for reading, writing and editing meta information in a wide variety of files.
You may want to check out more Mac applications, such as ExifChanger, pyExifToolGui or PhotoGrok, which might be similar to ExifTool.