Archiver with command-line support.
# Highest compression ratio in new 7z format
# 7-Zip is free software distributed under the GNU LGPL
# Supported formats: 7z, ZIP, CAB, RAR, ARJ, GZIP, BZIP2, TAR, CPIO, RPM and DEB
# For ZIP and GZIP formats 7-Zip provides compression ratio that is 2-10 % better than ratio provided by PKZip and WinZip
# Self-extracting capability for 7z format
# Integration with Windows Shell
# Powerful File Manager
# Powerful command line version
Also at
https://sourceforge.net/projects/sevenzip.
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http://7-zip.org/