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
FilterProxy
FilterProxy is a generic http proxy with the capability to modify proxied content on the fly. It has a modular system of filters which can modify web pages. The modular system means that many filters can be applied in succession to a web page, and configuration is easy and flexible. FilterProxy can proxy any data served by the HTTP protocol (i.e. anything off the web), and filter any recognizable mime-type. All configuration is done via web-based forms, or editing a configuration file. It was created to fix some of the annoyances of poor web design by rewriting it. It also can improve the web for you, in both speed (Compress) in quality (Rewrite/XSLT). After ads (and their graphics) are stripped out, and html is compressed, surfing over a modem is much faster. Compare to Muffin (a similar project in java), and WebCleaner (a similar project in python) in purpose and functionality. FilterProxy is written in perl, and is quite fast.
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