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Carrot2 is an Open Source Search Results Clustering Engine. It can automatically organize small collections of documents, e.g. search results, into thematic categories. Carrot2 integrates very well with both Open Source and proprietary search engines.

Carrot2 Web Site


  • two high-quality document clustering algorithms
  • integrates with public and open source search engines (Solr, Lucene)
  • easy to integrate with Java and non-Java software
  • ships a GUI application for tuning clustering for specific collections
  • ships with a simple web application
  • native C# / .NET API

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Additional Project Details

Intended Audience

Developers, Education, System Administrators

User Interface

Java SWT, Web-based

Programming Language



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