Description
"Solr is an open source enterprise search platform, written in Java, from the Apache Lucene project. Its major features include full-text search, hit highlighting, faceted search, real-time indexing, dynamic clustering, database integration, NoSQL features and rich document (e.g., Word, PDF) handling" More...
Link to a short (5 minute) demonstration of the key features of the tool or service.
From http://lucene.apache.org/solr/features.html: