7-Zip is a free an open source file archiver designed originally for Microsoft Windows, and later made available to other computer operating systems. In the form of p7zip, the command-line version of 7-Zip has been ported for use on Unix-like systems such as GNU/Linux, BSD, and Mac OS X as well as AmigaOS. It is also compatible with DOS via either a DOS port, or by using the HX-DOS extender to run the Windows command-line version.