7 Zip File Archive

7-Zip is an open source file archiver, or an application used to compress files. 7-Zip operates with the 7z archive format, but can read and write several other archive formats. The program can be used from a command line interface, graphical user interface, or with a window-based shell integration. 7-Zip began in 1999^[1] and is developed by Igor Pavlov. The cross-platformversion of the command line utility, p7zip, is also available.^[4]

7-Zip is open source software. Most of the source code is under the GNU LGPL license. The unRAR code is under a mixed license: GNU LGPL + unRAR restrictions