Apache Solr - Solr is an open source enterprise search server based on Lucene search library, with XML/HTTP and...
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.
ElasticSearch - Elasticsearch is an open source, distributed, RESTful search engine.
Websolr - Exterprise-grade search powered by open-source Apache Solr.
RevBits Deception Technology - RevBits deception technology solutions provides simple and rapid deployment options for all popular servers and applications. Know more about the RevBits deception security solutions.
Algolia - Algolia's Search API makes it easy to deliver a great search experience in your apps & websites. Algolia Search provides hosted full-text, numerical, faceted and geolocalized search.