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.
The main features of 7-Zip
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High compression ratio in new 7z format with LZMA compression
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Supported formats:
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Packing / unpacking: 7z, XZ, BZIP2, GZIP, TAR, ZIP and WIM
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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.
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For ZIP and GZIP formats, 7-Zip provides a compression ratio that is 2-10 % better than the ratio provided by PKZip and WinZip
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Strong AES-256 encryption in 7z and ZIP formats
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Self-extracting capability for 7z format
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Integration with Windows Shell
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Powerful File Manager
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Powerful command line version
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Plugin for FAR Manager
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Localizations for 79 languages
7-Zip - 64bit software
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Current version: 22.00
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Version date: 2022-06-20