KillAd
- Freeware for Windows 95/98/ME/NT4. Kills web browser pop-up ad windows.
- http://www.fsc-soft.com/pleasedontlinkheredirectly.htm

AdSubtract
- Freeware and commercial versions for Windows 95/98/ME/NT4/2000. Runs in browsers java virtual machine and kills ads and cookies, slowish.
- http://www.intermute.com/products/adsubtract.html

WebWasher Classic
- Donationware for Windows. Ad filtering proxy which Includes Cookie, Popup, Animated Image, Referrer and Webbugs filter. Has automatic browser configuration for Netscape 3-6, Internet Explorer 3-5 and Opera 3-5.
- http://www.cyberguard.com/products/webwasher/webwasher_products/classic/

gozer.org: Mozilla: Ad Blocking
- How to use Mozilla and Firefox to create custom CSS rules to hide certain elements based on their attributes and values.
- http://www.gozer.org/mozilla/ad_blocking/

PithHelmet
- An extended site preferences and ad blocking plugin for Apple's Safari browser. The basic purpose of the plugin is to allow the user to control the blocking of ad images, Flash, Shockwave or midi loops.
- http://culater.net/software/PithHelmet/PithHelmet.php

Ad Blocking via CSS
- How to use CSS rules to block ads. The technique works for any Gecko-based browser and for Apple's browser, Safari.  It even works with the Thunderbird mail client.
- http://www.floppymoose.com/

AdsCleaner
- Ad stopper and pop up blocker with additional features. Commercial. Windows NT/2000/XP.
- http://www.adscleaner.com/

Rabbit
- Freeware for any OS with JAVA. Proxy designed to speed surfing over slow links, by removing adverts and compressing the data stream using gzip and jpegs. Innovative approach.
- http://rabbit-proxy.sourceforge.net/

Gorilla Design Studio Presents: The Hosts File
- Free for all platforms. A hosts file for blocking the hostnames of major advertisers.
- http://accs-net.com/hosts/

Mike's Ad Blocking Hosts File
- Free for all platforms. A hosts file that block major advertisers' hostnames.
- http://everythingisnt.com/hosts.html

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.
- http://www.mvps.org/winhelp2002/hosts.htm

Ad Extinguisher
- Freeware for Windows 95/98/ME/NT4/2000. Small proxy that blocks banner ads and some web bugs, also freezes animated gifs.
- http://www.bhatt.id.au/adext/

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.
- http://www.zaplet.org/adzapper/

Web Ad Blocking Under Linux/Unix, BeOS, MacOS and Windows
- Step-by-step instructions on how to block advertisements.
- http://www.ecst.csuchico.edu/~atman/spam/adblock.shtml

ZeroClick
- Freeware for Unix/Linux/Macintosh/Windows 95/98/ME/NT4. Web proxy that closes popup windows and turns banner ads into transparent GIFs. Configurable with regular expressions, pure Java and covered under GPL.
- http://u1.netgate.net/~snowcat/zeroclick/

WebFilter
- Freeware for Unix. Web advertising filter based on Cern's httpd web server.
- http://math-www.uni-paderborn.de/~axel/NoShit/

V6 Web Engine
- Freeware for Unix. General purpose Web filtering and processing proxy. Source and binary distributions available.
- http://pauillac.inria.fr/~rouaix/V6/

nobanner
- Freeware for Unix/Linux. Web proxy written in Perl which rewrites HTML on the fly to remove ads.
- http://cornvalley.peak.org/nobanner/

Ad Muncher
- Shareware for Windows 95/98/ME/NT4/2000/XP. Small, patch for common web browsers. Removes banners, buttons, popups.
- http://www.admuncher.com/

Internet Watcher
- Commercial software for Windows 95/98/ME/NT/2000. Ad remover, automatically configures browser, and comes in five European languages.
- http://www.internetwatcher.com/

Squid
- Freeware for Unix. Caching proxy which can block ads. You can also use squidGuard and SleezeBall to help do this.
- http://www.squid-cache.org/

JunkBuster
- Freeware for Unix/Linux/FreeBSD/OS2/BeOS/Windows 95/98/ME/NT4. Web proxy that filters banner ads, cookies, and referer tracking. Supports wafers and User-Agent spoofing.
- http://internet.junkbuster.com/

Guidescope
- Free for non-commercial use, for Linux/Sparc/Solaris/Windows95/98/ME/NT/2000. Proxy that filters ads by pattern matching and blacklist. Also filters cookies and referers.
- http://www.guidescope.com/

WebMask
- Freeware program for Windows 95/98/NT4. Open source program to remove Web ads. No longer under development by author.
- http://www.flourish.org/webmask/

Cut the Crap (CTC)
- Freeware for Unix/Linux. Proxy-like open-source daemon written in Python to filter out ads for dialup users.
- http://www.softlab.ece.ntua.gr/~ckotso/CTC/

Ad Filtering programs
- Comprehensive list of advert filtering applications.
- http://www.flourish.org/adremove/