StuffIt Expander® is a free download or included as a feature of StuffIt Deluxe®.
StuffIt Expander® Mac free file extractor can be downloaded separately or as an included feature of StuffIt Deluxe®. Expander allows you to access StuffIt files, uncompress Zip archives, and decompress RAR files, TAR, GZIP, BZIP archives, and more. Just drag, drop, and you're done! All StuffIt Mac products require Mac OS X 10.8 or higher and are OS X Mavericks compatible.