7-Zip is a free and open-source file archive, a utility used to place groups of files within compressed containers known as “archives”. It is developed by Igor Pavlov and was first released in 1999. 7-Zip uses its own 7z archive format, but can read and write several other archive formats.Wikipedia
License: GNU LGPLv2.1+ with unRAR restriction / LZMA SDK in the public domain
Stable release: 18.06 (30 December 2018; 45 days ago)
Initial release date: July 18, 1999
Operating system: Windows, Linux, macOS, ReactOS
Preview release: 18.03 beta (March 4, 2018; 11 months ago)
Size: 1.1–1.7 MB