Copied from 7-Zip homepage:


License

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.

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.


The main features of 7-Zip

High compression ratio in 7z format with LZMA and LZMA2 compression

Supported formats:
Packing / unpacking: 7z, XZ, BZIP2, GZIP, TAR, ZIP and WIM
Unpacking only: ARJ, CAB, CHM, CPIO, CramFS, DEB, DMG, FAT, HFS, ISO, LZH, LZMA, MBR, MSI, NSIS, NTFS, RAR, RPM, SquashFS, UDF, VHD, WIM, XAR and Z.

For ZIP and GZIP formats, 7-Zip provides a compression ratio that is 2-10 % better than the ratio provided by PKZip and WinZip

Strong AES-256 encryption in 7z and ZIP formats

Self-extracting capability for 7z format

Integration with Windows Shell

Powerful File Manager

Powerful command line version

Plugin for FAR Manager

Localizations for 79 languages


7-Zip works in Windows 7 / Vista / XP / 2008 / 2003 / 2000 / NT / ME / 98.
There is a port of the command line version to Linux/Unix.

On 7-Zip's Source Forge Page you can find a forum, bug reports, and feature request systems.


Compression ratio

Compression ratio results are very dependent upon the data used for the tests. Usually, 7-Zip compresses to 7z format 30-70% better than to zip format.
And 7-Zip compresses to zip format 2-10% better than most of other zip compatible programs.


Changelog:


9.20           2010-11-18
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- Some bugs were fixed.


9.19 beta      2010-11-11
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- The console version now doesn't show entered password.
- Some bugs were fixed.


9.18 beta      2010-11-02
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- 7-Zip now can unpack SquashFS and CramFS filesystem images.
- 7-Zip now can unpack some TAR and ISO archives with incorrect headers.
- New small SFX module for installers (in Extra package).
- Some bugs were fixed.


9.17 beta      2010-10-04
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- Disk fragmentation problem for ZIP archives created by 7-Zip was fixed.


9.16 beta      2010-09-08
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- 7-Zip now supports files that are larger than 8 GB in TAR archives.
- NSIS support was improved.
- Some bugs were fixed.
- New localizations: Hindi, Gujarati, Sanskrit.


9.15 beta      2010-06-20
-------------------------
- Some bugs were fixed.
- New localization: Tatar.


9.14 beta      2010-06-04
-------------------------
- WIM support was improved.


eD2k Link:
ed2k://|file|7z920-x64.msi|1376768|3FF09BD57C0C0215674F52ED27F518CB|h=ZODV56K6L3YJPFAYHA375IUS35WVWSCI|/