It’s features include:
- open a wide variety of file archives, including:
- macOS .pkg package files,
- .dmg disk images,
- macOS asset catalogs,
- Mac OS 9 Installer Tome files, and
- .zip, .tar, .tar.gz, .tar.bz2, .xar, and .yaa archives,
- examine and extract individual files and folders,
- inspect install scripts and other package resources to make sure that a package is trustworthy before installing it,
- analyze existing installations on your system, to help you determine who installed a particular file on your system,
- view archive contents straight from the Finder via QuickLook,
- view and extract files from archives via your choice of a slick GUI or an automation-friendly command-line interface, and even
- inspect the contents of .zip files (and other supported types) over the Web without downloading the entire archive first.
I love that it lets you go into an installer and just extract what you want from it. This is such a powerful tool for $20.00 and I have owned various versions for years.