Mindbreeze Inspire - InSpire is a high-performance enterprise search product and big data solution to use out of the package for all of a company's data sources.

Apache Solr - Solr is an open source enterprise search server based on Lucene search library, with XML/HTTP and...

ElasticSearch - Elasticsearch is an open source, distributed, RESTful search engine.

Websolr - Exterprise-grade search powered by open-source Apache Solr.

Google Enterprise Search - Google Enterprise Search provides organizations with internal search capability and improved site search functionality.

Attivio - Attivio is an enterprise search and Big Data discovery platform that enables leaders to take action with confidence.