PKZip

PKWare is the originator of the Zip archive format.  This site offers a standard version for $30 and a professional version for $50.

WinZip

WinZip is fairly popular.  This site offers a free evaluation copy (you may use it for a limited amount of time) and a licensed copy for $30.

7-Zip

7-Zip is distributed as freeware under the GNU Project license as defined by by the Free Software Foundation.  GNU provides many free products that are generally high quality.  Donations for the foundation are solicited.

WiZ

This product is freeware.

UltimateZip

This product is freeware.

123 Zip!

This product is shareware: You may download it for evaluation, but you are expected to send in payment if you intend to keep using it.