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. http://www.privoxy.org/
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. http://www.proxomitron.info/
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. http://www.xstop.com
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. http://www.symantec.com/sabu/nis/nis_pe/