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.

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

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.

AB Tasty - AB Tasty is an all-inclusive platform for conversion rate optimization, personalization, customer activation, and testing.

Adoric - Adoric is SaaS and enterprise services company which provides solutions for inbound marketing and funnel optimization. 

uptain - uptain develops automated solutions for regaining lost customers in online shops.