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PhpDig
PhpDig is a http spider/search engine written in Php with a MySql database in backend. Indexing after indexing, PhpDig builds a glossary with the key words found in indexed pages. On a search query, it displays a result page with documents which contains the search keys, ranked by occurence.
URL: http://phpdig.toiletoine.net/
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Cost: Apache, Ph Platforms: N/A Version: Free (GPL)