SquidGuard is a URL redirector used to use blacklists with the proxysoftware Squid. There are two big advantages to squidguard: it is fast and it is free. SquidGuard is published under GNU Public License. Current version: 1.3 Features: Included configurable logging. Progress bar when compiling blacklists. Full sed compliance for rewrite statements. Blocking of urls with hostnames. Some more detail