ExifToolGUI is not available for Mac but there are some alternatives that runs on macOS with similar functionality. The best Mac alternative is ExifTool, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 10 alternatives to ExifToolGUI and eight of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to ExifToolGUI are NX Studio (Free), MetaImage (Paid), Exiv2 (Free, Open Source) and shootShifter (Paid).
MetaImage is the ultimate tool to read, write and edit images metadata. This is first editor that allows you to edit EXIF, IPTC and XMP tags as well as MakerNotes in a beautiful and familiar interface.
shootShifter helps to redate and rename complete folders of images based on the EXIF-data or finder-dates. With the preview-timeline its quite easy to synchronize several folders that were taken with differing camera-dates.