Ad Extinguisher
Freeware for Windows 95/98/ME/NT4/2000. Small proxy that blocks banner ads and some web bugs, also freezes animated gifs.

Ad Filtering programs
Comprehensive list of advert filtering applications.

Ad Muncher
Shareware for Windows 95/98/ME/NT4/2000/XP. Small, patch for common web browsers. Removes banners, buttons, popups.

AdsCleaner
Ad stopper and pop up blocker with additional features. Commercial. Windows NT/2000/XP.

AdSubtract
Freeware and commercial versions for Windows 95/98/ME/NT4/2000. Runs in browsers java virtual machine and kills ads and cookies, slowish.

Adzapper
Freeware for RedHat Linux 6.2/Unix/Windows 95/98/NT4. Open source rule-based filtering proxy written in Python to transform banner ads into transparent GIFs.

Blocking Unwanted Parasites with a Hosts File
Free for all platforms. A hosts file that blocks most major advertisers, parasites, hijackers and unwanted search engines.

Cut the Crap (CTC)
Freeware for Unix/Linux. Proxy-like open-source daemon written in Python to filter out ads for dialup users.

Gorilla Design Studio Presents: The Hosts File
Free for all platforms. A hosts file for blocking the hostnames of major advertisers.

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