Apache Solr - Solr is an open source enterprise search server based on Lucene search library, with XML/HTTP and...
Varonis DatAnswers - Varonis DatAnswers is a leading enterprise search and discovery platform that deliver secure and relevant searches for authorized NAS, Windows files servers and share point users.
ElasticSearch - Elasticsearch is an open source, distributed, RESTful search engine.
SearchBlox - SearchBlox is an out-of-the-box Enterprise Search Solution built on top of Apache Lucene/Solr.
Coveo - Enterprise search technology for better customer support, customer self-service, and knowledge management in the digital workplace.
Lookeen - Lookeen is an enterprise search and desktop search software designed for individuals and enterprises. Its key function is Outlook search.