Web Filters, Content filters
Content-control software, also known as censorware or web filtering software, is a term for software designed and optimized for controlling what content is permitted to a reader, especially when it is used to restrict material delivered over the Web. Content-control software determines what content will be available on a particular machine or network; the motive is often to prevent persons from viewing content which the computer's owner(s) or other authorities may consider objectionable; when imposed without the consent of the user, content control can constitute censorship.
From : http://en.wikipedia.org/wiki/Content-control_software
Proxomitron
Proxomitron: a free, highly flexible, user-configurable, small but very powerful, local HTTP web-filtering proxy.
Proxomitron at it's heart is a powerful text matching engine specially designed to re-write web pages on the fly, as you view them in your browser.
Getting rid of many common annoyances is as simple as clicking on one of the filtering rules included with the program, but best of all, the Proxomitron's rules aren't "hard-coded". You can look at them, modify them, even write entirely new ones!
If you know some HTML, you'll find the Proxomitron allows you to personally customize just about any web page you view. You'll no longer be at some web-master's tender mercy. Even if you know no HTML, you'll find the included rules give you far more control than you've ever had before.
Here's a partial list of what the Proxomitron can do "out of the box"
(not that it was ever in a box mind you)
Stop windows that pop-up, pop-under, or pop-over
Stop those un-closable endless banner chains
Stop pop-up JavaScript message boxes
Remove web-branding and other scripts tacked on by "free" web providers.
Convert most ads and banner pictures into simple text links
Freeze all animated gifs
Make blinking text appear as bold instead
Remove slow web counters
Stop web pages from "auto-refreshing"
Prevent pages from changing fonts
Get rid of or replace web page background images
Protect against getting "trapped" inside someone else's frames!
Make all frames resizable
Close top or bottom frame banner windows
Protect against getting "trapped" inside someone else's frames!
Make background MIDI songs play only when you choose.
Remove status bar scroll-texts
Remove "dynamic" HTML from pages
Disguise your browser's identity and version from JavaScripts
Remove style sheets
Un-hide URLs when the mouse is over a link
Disable frames or tables altogether
Change or delete cookies
Change your browser's user-agent and other identifying fields
Hide where you've been previously from inquisitive web servers
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