1. Elasticsearch is an open source, distributed, RESTful search engine.

  2. 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.

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

  4. 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.

  5. The simplest way to add search to your website or application. Sign up for free.

  6. Sphinx is an open source full text search server, designed with performance, relevance (search quality), and integration simplicity in mind. Sphinx lets you either batch index and search data stored in files, an SQL database, NoSQL storage.

  7. Amazon CloudSearch is a fully-managed service in the cloud that makes it easy to set up, manage, and scale a search solution for your website.

  8. Site Search 360 enhances and improves your built-in CMS search with autocompletion, semantic search, filters, facets, detailed analytics, and a whole lot of customization options.

    freemium $9.0 / Monthly ("1,500 pages/products", "5,000 monthly searches")

  9. Xapian is an open source probabilistic information retrieval library, released under the GNU...

  10. The simple way to create a great search experience for your users and your team.

  11. OpenSearchServer is an open source application server allowing development of index-based...

  12. 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.