Barilliance - Barilliance enables e-commerce sites of any size to deliver a personalized shopping experience by...
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.
RetailRocket - RetailRocket offers personalization and product recommendation engine for eCommerce.
ElasticSearch - Elasticsearch is an open source, distributed, RESTful search engine.
Nosto - Personalized shopping experiences for e-commerce businesses
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.