Apache Solr
Solr is an open source enterprise search server based on the Lucene Java search library, with XML/HTTP and JSON APIs, hit highlighting, faceted search, caching, replication, and a web administration interface.
Proprietary alternative(s):
Velocity Search Platform
Proprietary alternative(s):
Exalead CloudView
Supporting Organization:
Apache Software Foundation
Go to:
Apache Solr's Web Site 