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

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

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

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/

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/