OpenSearchServer
ElasticSearch
Xapian
Algolia
Apache Solr
Cludo
SearchUnit
Swiftype
SearchSpring
Algolia
ElasticSearch
Swiftype Site Search
Hawk Search
Nosto
Klevu
Nextopia
OpenSearchServer SearchSpringElasticSearch - Elasticsearch is an open source, distributed, RESTful search engine.
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.
Xapian - Xapian is an open source probabilistic information retrieval library, released under the GNU...
Swiftype Site Search - Swiftype Site Search helps to sell more, get the right answer to more people on the platform and surface relevant content for readers and followers.
Apache Solr - Solr is an open source enterprise search server based on Lucene search library, with XML/HTTP and...
Hawk Search - Site-search engine for eCommerce platforms.