P7zip is the unix command-line port of 7-zip, a file archiver that archives with very high compression ratios.
a standalone minimal version of the 7-zip tool that only handles
7z archives. 7z compression is 30-50% better than zip compression.
a gzip like wrapper around 7zr.
p7zip can be used with popular compression interfaces (e.g. file-roller and nautilus).
p7zip-full provides 7z and 7za which support more compression formats.