Adios Pop-Ups  
   Program to block and manage pop-up ads in Internet Explorer. It also provides cookie and history clearing tools.
   http://www.adiospopups.com/

BanPopup  
   A simple pop up ad killer.
   http://www33.brinkster.com/banpopup/

Cosmo Popup Blocker  
   Program will block popup banner ads, with white list functionality to allow popups from specific sites, also blocks messenger popups. Requires Internet Explorer.
   http://popbegone.askcosmo.com/

Free Popup Killer  
   Popup killer for Internet Explorer and AOL 3.
   http://www.free-popup-killer.com/

0pop  
   Destroys unsolicited pop-ups before they open. It also clears history, cookies, typed URLs, and cache. Two versions available free for no profit organizations, and shareware for commercial usage. [Windows 98/ME/NT 4/2000/XP]
   http://www.0pop.com/

PopupVanish  
   Stop all popup ads without interfering with the browsing. Requires Internet Explorer.
   http://www.kalavath.co.uk/popupvanish/

Pow  
   Software will automatically close any pop-up advertisement.
   http://www.analogx.com/contents/download/network/pow.htm

Zero-popups  
   Disables all popups with just a click of a button, automatically runs when Windows startup.
   http://www.zero-popups.com/

Free Pop Up Blockers  
   Offers free download of a popup blocker with reviews and links to other free solutions.
   http://www.freepopupblockers.net/

PopupXer  
   A popup blocker for advertisements and JavaScript error messages.
   http://www.popupxer.com/