<p>The Apache Lucene project develops open-source search software,
including:
</p>
<ul>
<!-- alphabetical, except Java, since it is likely the project of most interest -->
<li>
<a href="http://lucene.apache.org/java/"><strong>Lucene Java</strong></a>, our
flagship sub-project, provides Java-based indexing and search
technology, as well as spellchecking, hit highlighting and advanced analysis/tokenization capabilities.</li>
<li>
<a href="http://incubator.apache.org/droids/"><strong>Droids</strong></a> is an intelligent robot crawling framework currently in incubation.</li>
<li>
<a href="http://incubator.apache.org/lucene.net/"><strong>Lucene.Net</strong></a>
is a source code, class-per-class, API-per-API and algorithmatic
port of the <a href="http://lucene.apache.org/java/"><strong>Lucene Java</strong></a>
search engine to the C# and .NET platform utilizing Microsoft .NET
Framework. Lucene.Net is currently under incubation.
</li>
<li>
<a href="http://lucene.apache.org/lucy/"><strong>Lucy</strong></a> is a loose C
port of <a href="http://lucene.apache.org/java/">Lucene Java</a>, with Perl and Ruby
bindings.</li>
<li>
<a href="http://lucene.apache.org/mahout/"><strong>Mahout</strong></a> is a subproject with the goal of creating a suite of scalable machine learning libraries.</li>
<li>
<a href="http://lucene.apache.org/openrelevance/"><strong>Open Relevance Project</strong></a> is a new subproject with the aim of collecting and distributing free materials for
relevance testing and performance.</li>
<li>
<a href="http://lucene.apache.org/pylucene/"><strong>PyLucene</strong></a> is a Python port of the
the <a href="http://lucene.apache.org/java/">Lucene Java</a> project.</li>
<li>
<a href="http://lucene.apache.org/solr/"><strong>Solr</strong></a> is a
high performance search server built using
<a href="http://lucene.apache.org/java/">Lucene Java</a>, with XML/HTTP and JSON/Python/Ruby
APIs, hit highlighting, faceted search, caching, replication,
and a web admin interface.
</li></ul>
