What are some Winzip alternatives for Windows?

7-zip is a free alternative to Winzip and offers a variety of options for compressing files.
7-Zip can compress and uncompress file extensions such as 7z, zip, gzip, and tar.
7-Zip can uncompress files with file extensions such as rar, iso, cab, deb, and nsis.
7-Zip has support for x64 and 32-bit Windows machines.
http://www.7-zip.org/

WinRar is another alternative but is not free. WinRar can decompress file extensions such as rar, zip, rar, and iso.
http://www.rarlab.com/index.htm