7-ZIP

Do you have a feeling that even with such good compressing software as WinZip and WinRAR there is still room for perfection? You are probably right. Open Source software once again proved its superiority over commercial software with the introduction of 7-Zip.
7-Zip is a compression utility that lets you create, update, extract archive files of four most popular formats on the Internet: zip, gzip, tar and bzip2. Its simple, no-nonsense interface is integrated in the shell and can be accessed via the right-button menu. 7-Zip borrows much of its interface from the shell itself - an opened archive file looks as if it were a plain Explorer window. The only difference is the 'Extract' button. Owing mainly to that, the tool is incredibly fast even with huge archives with lots of subfolders and hundreds of files. The program also compresses files into smaller archives, some 40 or 50% smaller comparing to WinZip.
Besides the standard GUI interface, all the functions of the program can be accessed through the command line. Download this free tool today and enjoy this fast and reliable compression tool.

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: 7-Zip license.
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 87 languages
7-Zip works in Windows 10 / 8 / 7 / Vista / XP / 2013 / 2008 / 2003 / 2000 / NT. There is a port of the command line version to Linux/Unix.