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Re:ReStuff by pabs3 on Friday November 27, 2020 @09:21PM (#25234598)
The File Formats wiki seems to indicate The Unarchiver and a few other open source tools support this format:

http://fileformats.archiveteam.org/wiki/StuffIt

Edit: as does the ReStuff page actually.

Re:ReStuff by saagarjha on Friday November 27, 2020 @10:36PM (#25235049)
The Unarchiver has been acquired and is proprietary now, I believe.
Re:ReStuff by pabs3 on Friday November 27, 2020 @10:47PM (#25235101)
The command-line tools are still open source though:

https://theunarchiver.com/command-line