Search Framework

Apache Lucene
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Apache Lucene is a high-performance, full-featured text search engine library written entirely in Java. It is a technology suitable for nearly any application that requires full-text search, especially cross-platform.

Carrot2
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Carrot2 is an Open Source Search Results Clustering Engine. It can automatically organize (cluster) search results into thematic categories.

Carrot2 provides an architecture for acquiring search results from various sources (YahooAPI, GoogleAPI, MSN Search API, OpenSearch, Lucene index), clustering the results and visualising the clusters. Currently, 5 clustering algorithms are available that are suitable for different kinds of document clustering tasks.

MG4J
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Sphinx
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Sphinx is a full-text search engine, distributed under GPL version 2. Commercial license is also available for embedded use.

Enhydra Snapper
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Enhydra Snapper is a fulltext search library / framework in Java based on Apache Lucene to build search engine applications or integrate fulltext search into applications.

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