7zip

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7-Zip is an open source file archiver designed originally for Microsoft Windows. 7-Zip operates primarily with the 7z archive format, as well as being able to read and write to several other archive formats. A user can use the command line interface, graphical user interface, or Windows shell integration. 7-Zip began in 2000 and is actively developed by Igor Pavlov. It is related to a cross-platform port, p7zip.

Unlike WinZip and WinRAR programs, which are distributed under proprietary licenses, 7-Zip is distributed under the GNU Lesser General Public License. 7-Zip was the winner of the SourceForge.net 2007 community choice awards for "Technical Design" and for "Best Project".[2]