RAR is a general purpose archiving and compression program competing with/replacing programs such as PKZip, ARJ, and others. It offers significantly improved compression ratios, easier use and a cheaper price as well as supporting long file names, disk spanning, and self-extracting file creation.

You can also try RAR for Mac OS X, Linux, or FreeBSD.

Windows (All)
Shareware; $29.00
Uninstaller - Yes
Other Versions - WinRAR (64-bit)