The main features of 7-Zip
[li]High compression ratio in new 7z format with LZMA compression[/li][li]Supported formats:[/li][LIST]
[li]Packing / unpacking: 7z, ZIP, GZIP, BZIP2 and TAR[/li][li]Unpacking only: ARJ, CAB, CHM, CPIO, DEB, DMG, HFS, ISO, LZH, LZMA, MSI, NSIS, RAR, RPM, UDF, WIM, XAR and Z.[/li][/ul]
[li]For ZIP and GZIP formats, 7-Zip provides a compression ratio that is 2-10 % better than the ratio provided by PKZip and WinZip[/li][li]Strong AES-256 encryption in 7z and ZIP formats[/li][li]Self-extracting capability for 7z format[/li][li]Integration with Windows Shell[/li][li]Powerful File Manager[/li][li]Powerful command line version[/li][li]Plugin for FAR Manager[/li][li]Localizations for 74 languages[/li][/LIST]
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. Check license information here: http://www.7-zip.org/license.txt.
You can use 7-Zip on any computer, including a computer in a commercial organization. You don’t need to register or pay for 7-Zip.