A support site for RAR and WinRAR archivers.

A massively spiffy yet delicately unobtrusive compression library.

This URL takes you to a compression FAQ that explains compression to technical people as well as describing the various programs, and what they do to users.

WinZip is a windows data compression utility that focuses on the Zip data compression format for windows users. It took the lead from PKZIP when windows was introduced.