FitFileExplorer 3.5 for Mac could be downloaded 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 File Managers. We recommend checking the downloaded files with any free antivirus. This free Mac application was originally produced by Brice Rosenzweig.
From the developer:
FitFileExplorer is a simple open-source utility to open Fit files on your Mac. The goal of the utility is to show all the information in the Fit file rather than focusing on a subset of the information. For fields that contain many entries (record, laps, etc.), it will also display graphs of the data from the last column the user clicked on. If the data contains GPS coordinate, the track on a map will also be displayed.
You may want to check out more Mac applications, such as PDFGarden, AppMenuBoy or ACDSee 2 for Mac, which might be similar to FitFileExplorer.