Apisearch
Algolia
Apache Solr
ElasticSearch
Google Custom Search Engine
Site Search 360
Sphinx (search engine)
Swiftype
Relevanssi Light
Algolia
Site Search 360
ElasticSearch
Relevanssi
IADB
Google Custom Search Engine
Fork CMS
Apisearch Relevanssi LightAlgolia - 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.
Apache Solr - Solr is an open source enterprise search server based on Lucene search library, with XML/HTTP and...
Site Search 360 - Site Search 360 enhances and improves your built-in CMS or product search with autocompletion, semantic search, filters, facets, detailed analytics, and a whole lot of customization options.
ElasticSearch - Elasticsearch is an open source, distributed, RESTful search engine.
Google Custom Search Engine - Google Custom Search is a platform provided by Google that allows web developers to feature specialized information in web searches, refine and categorize queries and create customized search engines, based on Google Search.
Relevanssi - Relevanssi replaces the standard WordPress search with a better search engine, with lots of features and configurable options.