Optimizely - A/B testing you'll actually use.
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.
Dynamic Yield - Personalization & customer experience management
Nosto - Personalized shopping experiences for e-commerce businesses
AB Tasty - AB Tasty is an all-inclusive platform for conversion rate optimization, personalization, customer activation, and testing.
Tagalys - Data driven online Merchandising for eCommerce product listing pages.