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

Internet access management system allows an organization to monitor, report and manage internal Internet use.

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

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.

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

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.

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

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.

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