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 79 languages

• ZIP NOW 1.2
  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,...

• 7zip 4.85
  The main features of 7-Zip * High compression ratio in new 7z format with LZMA compression * Supported formats: o Packing / unpacking: 7z, ZIP, GZIP, BZIP2 and TAR o Unpacking only: ARJ, CAB, CHM, CPIO, DEB, DMG, HFS, ISO, LZH, LZMA, MSI, NSIS, RAR, RPM, UDF, WIM, XAR and Z

• Direct Zip Driver 1.0.0
  Direct Zip Driver is a powerful compressor and reader for computer files. As a compressor it can compress, extract and browse almost all compressed archives. As a reader it can map ZIP RAR, map CD/DVD image, map virtual hard disk, no need for...

• PeaZip 6.7.1
  PeaZip is a free archiver and file manager software, a fast and elegant all-purpose free ZIP files utility and free RAR extractor for Windows, Linux, and BSD

• PeaZip (64 bit) 3.9
  PeaZip is a free, open source file and archive manager. PeaZip is cross platform, available as portable and installable software for 32 and 64 bit Windows (9x, 2000, XP, Vista, 7) and Linux (PeaZip is a desktop neutral application). Full support: 7Z, 7Z-sfx, ARC/WRC, BZ2/TBZ2, GZ/TGZ, PAQ/LPAQ/ZPAQ, PEA, QUAD/BALZ, split, TAR, UPX, WIM, XZ,...

• PeaZip Portable 6.7.1
  PeaZip Portable is the ideal package when you want to use a free file archiver and compressor utility without modifying your system, either because you prefer natively portable software as replacement of installable software, or you need to bring it with you on an USB stick, or when you cannot modify the machine you are working on, or if you just want to try it without installing anything on the system: simply extract and use PeaZip, and simply delete its folder to remove the application

• PeaZip 64 bit 6.7.1
  PeaZip for Windows 64 bit is a free ZIP software optimized for WIN64 systems. The application is based on powerful and solid Open Source technology of 7-Zip for managing mainstream archive formats, and other great Open Source tools (like FreeARC,...

• 7-Zip 4.57
  7-Zip is a free and open source file archiver designed originally for Microsoft Windows, and later made available to other computer operating systems

• Winmount 1.2
  WinMount is a powerful compression tool, supports mou rar zip and many other files. It's also a virtual drive tool, supports mounting mou rar zip and CD DVD HDD image as a virtual...

• WinMount 64-bit Edition 3.4.1020
  Winmount is a powerful windows utility which is dedicated to managing files and disks impressively and conveniently