Maker of stand-alone external Internet content filtering appliances. [Windows]

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

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.

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.

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

A Java application which will cache, compress images and remove unwanted content in order to speed up the browsing process.

Firewall, anti-malware, anti-spam and phishing protection software which includes parental control add-on for filtering unsuitable websites. [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.