StuffIt Expander

StuffIt Expander was a freeware decompression utility which could expand a wide variety archive formats. It did not compress files like its commercial sibling StuffIt Deluxe. It was often included with classic Mac OS and very widely used. As Apple included its own Archive Utility with Mac OS X, its usage declined and was finally discontinued in 2019.

History
StuffIt was originally written for 68k Macs in 1988 by Leonard Rosenthol, and ran on System 6.0.4 and later. It was later updated by Raymond Lau with PowerPC support, and then sold to Aladdin Systems. The original version only expanded the original StuffIt 1.0 style Macintosh archive; Lau later updated it to support Compact Pro (.cpt) archives as well. When Aladdin purchased it, they added support for Disk Doubler archives and other formats. It was eventually purchased by SmithMicro, at which point it was a generic unarchiving solution and could handle pretty much every archive and encoding format available for Macintosh, Windows and Linux operating systems. Versions were made available for both Mac OS X and Windows.