7-zip is a free open source archive file compression and extraction utility. Create Zip, 7z, Tar, and Wim files. Open the dozens of archive file formats.
7-Zip Home Page
7-Zip is a powerful open source file archiver available for free.
By default it uses its own 7z archive format, but can also create some of the other more
common formats like ZIP and TAR.
7-Zip cannot create RAR files, but it can open them and extract their contents.