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.
Porter-Stemmer
This module reduces each word in the index to its basic root or stem (e.g. 'blogging' to 'blog') so that variations on a word ('blogs', 'blogger', 'blogging', 'blog') are considered equivalent when searching. This generally results in more relevant results.
Technology:
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