See also: Proxy | Filtering Proxy | Censorship
Home Page: http://dansguardian.org
Adapted from homepage:
“DansGuardian is a web content filter which currently runs on Linux, FreeBSD, OpenBSD, NetBSD, Mac OS X, HP-UX, and Solaris. It filters the actual content of pages based on many methods including phrase matching, PICS filtering and URL filtering. It does not purely filter based on a banned list of sites like lesser totally commercial filters.
DansGuardian is designed to be completely flexible and allows you to tailor the filtering to your exact needs. It can be as draconian or as unobstructive as you want. The default settings are geared towards what a primay school might want but DansGuardian puts you in control of what you want to block.”
A more extensive description and feature list is available here: http://dansguardian.org/?page=introduction
It can be used together with about any proxy, including Squid
TakeDown.NET -> “DansGuardian”