7-zip
(Version 4.4.2)

7-Zip is a program for creating or unpacking archived and compressed files. It can unpack 7zip, ZIP, CAB, RAR, ARJ, GZIP, BZIP2, TAR, CPIO, RPM and DEB files, or create file archives in those formats. For the standard ZIP and GZIP formats, 7-Zip provides a compression ratio that is 2 - 10 % better than that provided by PKZip or WinZip, and the native 7zip format can provide a 45% reduction in file size from the common zip format. The program is highly configurable, allowing the user to balance the level of compression and speed. The interface is designed to mimic the standard Windows shell, Explorer, and is localized to 40 languages. Though 7-Zip is free of charge, you have the option of "registering" if you would like official technical support for the program.