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Nutch is open source web-search software. It builds on Lucene Java, adding web-specifics, such as a crawler, a link-graph database, parsers for HTML and other document formats, etc. Its main feature include

  • Fetching, parsing and indexation in parallel and distributed
  • Plugin support
  • Ontology
  • Clustering
  • Distributed filesystem (via Hadoop)
  • Link-graph database
  • NTLM authentication
  • MapReduce
  • Many formats: plain text, HTML, XML, ZIP, OpenDocument (, Microsoft Office (Word, Excel, Powerpoint), PDF, JavaScript, RSS, RTF, MP3 (ID3 tags)



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