Linux.com looks at PhpDig. "PhpDig will index your site as frequently as you like via a cron job. Results are consistent and testable within minutes. PhpDig will crawl a single or multiple Web sites following links within the domain according to known rules and store the results in a MySQL database. Users can then use a search form provided by PhpDig to enter criteria and see immediately which pages appear to be relevant; and the results page is not subjected to commercial advertising."

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