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.
Automatically tagging content
Comparison of Automatic Tagging Tools for Drupal.
- Alchemy
AlchemyAPI provides content owners and web developers with a rich suite of content analysis and meta-data annotation tools. - OpenCalais
Calais is a rapidly growing toolkit of capabilities that allow you to readily incorporate state-of-the-art semantic functionality within your blog, content management system, website or application. - tagthe.net
- Yahoo Term Extraction
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