GNU Gzip is a software application used for file compression and decompression. It is based on the DEFLATE algorithm, which is a combination of LZ77 and Huffman coding.
Info-ZIP is a set of open-source software to handle ZIP archives. It has been in circulation since 1989. It consists of 4 separately-installable packages: the Zip and UnZip command-line utilities; and WiZ and MacZip, which are graphical user interfaces for archiving programs in...
dar is a shell command that backs up directory trees and files, taking care of hard links, Extended Attributes, sparse files, MacOS's file forks, any inode type (including Solaris Door inodes), etc.
zlib is a software library used for data compression. It is an abstraction of the DEFLATE compression algorithm used in gzip file compression program. zlib is also a crucial component of many software platforms including Linux, Mac OS X, and iOS.
bzip2 is a file compressor that uses the Burrows–Wheeler algorithm. It is only a compressor for single files and not a full archiver.
It features an extremely fast decoder, with speed in multiple GB/s per core, typically reaching RAM speed limits on multi-core systems.
