Stuffit 2010 combines Stuffit and Stuffit Expander into one program. You can also make .sit .sitx .zip and many more files with Stuffit 2010.  

StuffIt was the most versatile and used compression suite on the Mac since 1987.  It began as shareware and then it went commercial but StuffIt Expander (the decompression tool) always remained free and was even bundled by Apple on Mac OS...

StuffIt Deluxe 10.0 with serial number, runs on Mac OS X 10.3 and higher on PowerPC processors (i.e. G3, G4, G5).  

StuffIt Deluxe provides a suite of tools that help you compress, access, protect, send, backup, and organize all your important information. By combining multiple files and folders into a single compressed archive, StuffIt saves space on your hard...

Requires Mac OS X 10.1.5 or later.

Includes the Expansion Enhancer (Stuffit Engine)

StuffIt Expander 5.5 was the most commonly used archive extractor in the later 90's on Mac OS 8 until the standard edition 7.0 came bundled with Mac OS 9.  Until version 7, StuffIt Expander 5.5 was a must have tool especially for people...