AdsGone - does more than block popups: It blocks Messenger Service spam, Flash ads, banner ads, spyware, and adware. AdsGone also blocks ads from programs such as Kazaa and Morpheus, as well as ads from chat programs such as ICQ, AIM, Trillian, and MSN Messenger. AdsGone provides additional protection even if you run a firewall such as ZoneAlarm or antispyware software such as Ad-aware...

Pop-Up Stopper Free Edition - this spyware-free tool blocks pop-up ads in Netscape, Internet Explorer, and Mozilla. It can block Messenger Service and desktop ads, too. There's no need to adjust proxy settings or add sites to a list. Pop-Up Stopper will not strip Web images or slow your browser. You can allow pop-up windows when you want them...

STOPzilla - this very effective pop-up blocker keeps a blacklist of all stopped pop-ups for easy management and includes a couple of additional privacy features. Unlike some other pop-up blockers, Stopzilla does not add buttons or a toolbar to your browser--you have to control it from its own interface. Fortunately that interface is easily accessible from a system tray icon...

Smart Popup Blocker - this absolutely standard, yet free pop-up blocker, worked quite well in our tests, but like many of its brethren, it is powerless against floating pop-ups. Smart Popup Blocker indicates its presence with a system-tray icon and will blink or emit a gunshot sound when eliminating a pop-up ad. If you occasionally want pop-ups from certain sites...