Compression

7-Zip is a file archiver with a high compression ratio. 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.

PeaZip is a free file archiver utility, similar to WinRar, WinZip, and 7-Zip (or File Roller, and Ark on Linux), based on Open Source technologies. As archive manager utility, PeaZip provides fast, high compression ratio multi-format archiving to 7Z, ARC, Brotli, BZ2, GZ, PEA, TAR, WIM, Zstandard and ZIP archives (write supported formats), and works as opener / extractor tool for 200+ archive types including ACE, ISO, RAR, ZIPX files, including ability to manage encrypted archives for supported formats.