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.
Personyze - Personyze is an omnichannel website personalization solution with every tool you need to achieve an end-to-end personalized visitor experience, with no IT involvement.
RichRelevance - MyBuys
Optimizely - A/B testing you'll actually use.
Dynamic Yield - Personalization & customer experience management