This is fdupes 2.2.0. If you're an end-user then you probably want the file named fdupes-2.2.0.tar.gz. The other archives are created automatically by GitHub and are intended for developers.
Changes from 2.1.2 to 2.2.0:
- Add --deferconfirmation option.
- Check that files marked as duplicates haven't changed during program execution before deleting them.
- Update documentation to indicate units for SIZE in command-line options.
- Move some configuration settings to configure.ac file.