StuffIt Expander

StuffIt Expander is a proprietary, freeware, closed source, decompression software utility developed by Allume Systems (a subsidiary of Smith Micro Software formerly known as Aladdin Systems). It runs in Mac OS Classic, Mac OS X, Microsoft Windows, and Linux x86/UNIX.

As of November 2010, the latest Macintosh version is 2011 (15.0.2), which requires Mac OS X v10.5 or later. Version 2010 (14.0.1) runs on Mac OS X v10.4, version 10.0.2 runs on Mac OS X v10.3, and version 8.0.2 runs on Mac OS X v10.0 through Mac OS X v10.2. The latest version for Mac OS 9 is 7.0.3.

As of September 2011, the Linux version is no longer available for download from the official page.

StuffIt has been a target of criticism and dissatisfaction from Mac users in the past as the file format changes frequently, notably during the introduction of StuffIt version 5.0. Expander 5.0 contained many bugs, and its file format was not readable by the earlier version 4.5, leaving Mac users of the time without a viable compression utility.