A free file archiver for extremely high compression
...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. And there is command line version for Linux and macOS. Most of the source code is under the GNU LGPL license. The unRAR code is under a mixed license with GNU LGPL + unRAR restrictions. Check the license for details.
The 7-Zip derivative intended for the modern Windows experience
NanaZip is an open source file archiver intended for the modern Windows experience, forked from the source code of well-known open source file archiver 7-Zip. Source code is hosted at https://github.com/M2Team/NanaZip.
Set of Add-ins to run standard Cygwin/Unix command line facilities from Excel. Creates batch files, runs them as part of excel (or independent of) to : ZIP, GZIP, BZIP2 files, dos2unix & unix2dos files. Also automates DOS DIR to list files to spreadsheet