Optimizely - A/B testing you'll actually use.
Clearbit - Clearbit provides Business Intelligence APIs
Dynamic Yield - Personalization & customer experience management
ZoomInfo - ZoomInfo is a B2B database providing detailed business information on people and companies.
AB Tasty - AB Tasty is an all-inclusive platform for conversion rate optimization, personalization, customer activation, and testing.
InsideView - InsideView aggregates and curates all the company and contact data, news and social insights, and professional connections you need to do business better.