WinRAR is a powerful archive manager. It can backup your data and
reduce size of email attachments, decompress RAR, ZIP and other files
downloaded from Internet and create new archives in RAR and ZIP file
format.

RAR (WinRAR), the powerful archiver and archive manager (Win32, Linux, Mac)

WinRAR is a powerful compression tool with many integrated additional functions to help you organize your compressed archives.

WinRAR
puts you ahead of the crowd when it comes to compression. By
consistently creating smaller archives, WinRAR is often faster than the
competition. This will save you disc space, transmission costs AND
valuable working time as well.

WinRAR supports all popular compression formats (RAR, ZIP, CAB, ARJ, LZH, ACE, TAR, GZip, UUE, ISO, BZIP2, Z and 7-Zip).