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...

Optimizely - A/B testing you'll actually use.

RetailRocket - RetailRocket offers personalization and product recommendation engine for eCommerce.

Dynamic Yield - Personalization & customer experience management

Tamber - Tamber is a recommendation engine for developers that build fast, head-scratchingly accurate hosted recommendation engines in minutes.