Download 7-Zip for Windows:
Download links redirect to a download page on SourceForge.net.
You can download any versions of 7-Zip (including latest beta versions) from SourceForge:
Download p7zip for Posix/Linux (x86 binaries and source code):
p7zip is the command line version of 7-Zip for Unix/Linux, made by an independent developer.
Some unofficial p7zip packages for Linux and other systems:
7-Zip for other systems:
Copyright (C) 2012 Igor Pavlov.