7-Zip

Title	7-Zip
Developer	Igor Pavlov
Last Version	9.30 alpha (2012-10-26)
Stable Ver.	9.20 (2010-11-18)
Language(s)	English,Bulgarian,Chinese Simpl.,Chinese Trad.,Esperanto,French,German,Hungarian,Japanese, Polish,Portuguese,Brazil,Russian,Spanish,Ukrainian
Type	File archiver
Platform(s)	Microsoft Windows, GNU/Linux, Mac OS X
Official Web	http://www.7-zip.org
License	GNU LGPLv2.1 + with unRAR restriction*

*unRAR restriction means that you must follow both GNU LGPL rules and unRAR restriction rules.

The main features of 7-Zip:

• Powerful file manager
• High compression ratio and high speed
• Big number of supported archive formats
  

  Format	Compressing	Decompressing	Filename Extensions
  7z	X	X	7z
  XZ	X	X	xz
  ZIP	X	X	zip
  GZIP	X	X	gz gzip tgz
  BZIP2	X	X	bz2 bzip2 tbz2 tbz
  TAR	X	X	tar
  WIM	X	X	wim swm
  LZMA		X	lzma
  RAR		X	rar
  CAB		X	cab
  ARJ		X	arj
  Z		X	z taz
  CPIO		X	cpio
  RPM		X	rpm
  DEB		X	deb
  LZH		X	lzh lha
  SPLIT		X	001 002 ...
  CHM		X	chm chw hxs
  ISO		X	iso
  UDF		X	iso
  COMPOUND		X	msi doc xls ppt
  DMG		X	dmg
  XAR		X	xar
  HFS		X	hfs
  NSIS		X	exe
  NTFS		X	ntfs
  FAT		X	fat
  VHD		X	vhd
  MBR		X	mbr
  SquashFS		X	squashfs
  CramFS		X	cramfs

  
  ZIP
  7-Zip creates ZIP compatible archives. 7-Zip supports the following ZIP compression methods:
  • 0 - Store
  • 8 - Deflate
  • 9 - Deflate64
  • 12 - BZip2
  • 14 - LZMA
  • 98 - PPMd
  • 1 - Shrink (decompression only)
  • 6 - Implode (decompression only)
  Files compressed with other ZIP compression methods can't be extracted by the current version of the 7-Zip. But these supported methods are the most popular today, and therefore 7-Zip can decompress most ZIP archives. To extract files compressed with non-supported methods you must use some other ZIP utility.
  7-Zip supports the Zip64 extension of ZIP format.
  The current version of 7-Zip doesn't support Zip multivolume archives.
  
  LZH
  7-Zip supports LZH archives only for listing, browsing and decompressing. 7-Zip supports -lh0-, -lh4-, -lh5-, -lh6- and -lh7- methods.
  
  
• Additional command line version
  7z.exe is the command line version of 7-Zip. 7z.exe uses 7z.dll from the 7-Zip package. 7z.dll is used by the 7-Zip File Manager also.
  7za.exe (a = alone) is a standalone version of 7-Zip. 7za.exe supports only 7z, lzma, cab, zip, gzip, bzip2, Z and tar formats. 7za.exe doesn't use external modules.

source:7Zip Help

Download Page for all platforms:

7-Zip