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.

Google Custom Search - Google Custom Search enables you to create a search engine for your website, your blog, or a collection of websites.

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

Sooqr - Sooqr Search provides relevant and innovative site search engine for the website.

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.

Optim’Match - Optim’Match is a platform that enables users to unleash the power of machine learning to attract, convert, and retain customers.