- A tool for archiving and compressing old email in mailboxes. It moves messages older than the specified number of days to a separate mbox format mailbox that is compressed with gzip. It can also be used as a backup tool.
DAR - Disk ARchive
- An archiving tool and a replacement for tar with features such as: archive merging, compression, directory tree snapshots, differential backup,filters, and slices.
UPX - Ultimate Packer for eXecutables
- A free, portable, extendable, high-performance executable packer (file compression) for several different executable formats. Latest release is 3.03, 2008-04-27.