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Offers category based website filtering. Hardware and software solutions available. Product details including performance test results, free trial version, support pages. [Windows]

Internet Management's ClearServer Proxy/Caching appliance is a cache rack which provides server-based keyword and URL based filtering by 27 blocking categories.

Instructions and links to relevant tools.

An HTML-rewriting proxy with Web-forms based configuration and modules for XSLT, GIF deanimation, and compression. [Perl]

Open-source cross-platform filtering Web proxy server written in Java. It has a public API to create additional filters.

Through Internet Filtering, N2H2 Inc. delivers a suite of products that makes the Internet a Safer and more Productive resource.

Solutions for businesses, Internet Service Providers, schools, and libraries. News, product comparisons, Internet usage statistics. [Unix, Windows]

General proxy with text-matching rules for transforming and filtering pages and HTTP headers. Includes filters for animated GIFs, pop-up windows, ad banners, and dynamic HTML.

PureSight is a password protected, easy to use program, that runs silently on the computer and controls all of the communication to and from the PC.

is a combined filter, redirector and access controller plugin for Squid.