DansGuardian is a web content filter which currently runs on Linux, FreeBSD, OpenBSD 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 un-obstructive as you want.
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