List of information retrieval libraries

This is a list of free information retrieval libraries, which are libraries used in software development for performing it retrieval functions. It is not a complete list of such libraries, but is instead a list of free information retrieval libraries with articles on Wikipedia. It does not include commercial software libraries.

Libraries for searching and indexing

 * Lemur
 * Lucene
 * Solr
 * Elasticsearch
 * Manatee
 * Manticore search
 * Sphinx
 * Terrier Search Engine
 * Xapian