1. 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.

  2. 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.

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

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

  5. Sphinx is a tool that makes it easy to create intelligent and beautiful documentation, written by...

  6. 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.

  7. Site Search 360 enhances and improves the standard WordPress search with search suggests, autocompletion, semantic search, and a whole lot of customization.

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

  8. Modern Publishing, Simply taking your books from ideas to finished, polished books.

  9. 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.