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

Extension to Cern's httpd web server to filter out annoying parts of web pages.

Paper from W3C discussing research on an application specific Web proxy.

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

X-Stop allows homes and schools to provide safe Internet access and corporations to manage their employee's Internet usage. It facilitates an organization's goal of maintaining employee and network productivity while reducing the risk of legal liability.

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

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

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.

Instructions and links to relevant tools.

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

A combined filter, redirector and access controller plugin for Squid.

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.

Presentation by Christopher Browne to the North Texas Linux Users Group (NTLUG) in October 1997.

Commercial software for Windows 98/Me/2000/XP. Mainly used as a firewall and anti-virus checker, but has ad blocking and parental control capabilities.

An http cookie filter written in Python with an optional GUI. It acts as an http proxy and can either contact sites directly or work with a second proxy (eg. a cache).

A web proxy with advanced filtering capabilities for protecting privacy, modifying web page content, managing cookies, controlling access, and removing ads, banners, pop-ups and other Internet junk. Based on Internet Junkbuster.

Basic introduction to hosts file usage.

Keyword-based content filtering and virus scanning for Microsoft ISA Server.