If that doesn't suit you, our users have ranked more than 10 alternatives to Pivot Animator and four of them are available for Mac so hopefully you can find a suitable replacement. The best Mac alternative is Synfig Studio, which is both free and Open Source. Pivot Animator is not available for Mac but there are a few alternatives that runs on macOS with similar functionality.
See the readme.txt file for a full list of changes. The frame repeat value is now shown in the timeline thumbnails. Several other minor issues have been fixed. They will load faster and using less memory. The latest version of Pivot, which is more stable, especially when dealing with large animation files.
