Apache Lucene
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.
Proprietary alternative(s):
Velocity Search Platform
Proprietary alternative(s):
Exalead CloudView
Open Source alternative(s):
Xapian
Saas alternative(s):
SearchBlox Cloud Edition
Supporting Organization:
Apache Software Foundation
Go to:
Apache Lucene's Web Site 