Back in the day, on the MAC it was either CompactPRO or Stuffit Deluxe to handle file compression needs, especially during those 14.4kbps (and slower) file xfers! Nowadays Stuffit is available for the PC as well, and helps maintain cross platform file integrity if you transfer from MAC to PC and back. I don’t use it that much anymore, but it’s still a great utility nonetheless. For a trial version of the product, head here for version 12.