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.

Lucidworks Fusion - Lucidworks’ advanced search platform, provides the enterprise-grade capabilities needed to design, develop and deploy intelligent search apps at scale.

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

Citrix Gateway - Critix Gateway is a unified gateway for users that makes it easy for them to remotely access infrastructure with the help of a single sign-on across all applications.

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

Curiosity.ai - Find everything everywhere: Curiosity puts all your information at your fingertips so you can focus and get more done.