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