Solr is a free open source enterprise search platform developed by Apache.
Solr is a free open source enterprise search platform developed by Apache.
Its major features include powerful full-text search, hit highlighting, faceted search, dynamic clustering, database integration, rich document (e.g., Word, PDF) handling, and geospatial search. Solr is highly scalable, providing distributed search and index replication, and it powers the search and navigation features of many of the world's largest internet sites.
Source:Apache Solr