There are plenty of recommended free archive managers, but there are good reasons why you should look at some of the popular commercial alternatives, such as Stuffit for Windows. The primary reason is that this archive manager will enable you to handle just about any archived format, including the Mac-based .sit format. This archive format grew popular on the Mac as a version of Stuffit was included free with the Mac operating system for many years. Although many Mac users have moved over to .zip, it's still a well-used archive format on that operating system).03 Feb 2009