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.
Apache Solr - Solr is an open source enterprise search server based on Lucene search library, with XML/HTTP and...
SearchBlox - SearchBlox is an out-of-the-box Enterprise Search Solution built on top of Apache Lucene/Solr.
Websolr - Exterprise-grade search powered by open-source Apache Solr.
ElasticSearch - Elasticsearch is an open source, distributed, RESTful search engine.
Decisiv Search - Decisiv is an enterprise search solution enabling users to search multiple repositories at once to access documents, projects etc.