eMarketer - eMarketer is an independent market research company that provides insights and trends related to digital marketing, media and commerce.
Optimizely - A/B testing you'll actually use.
CB Insights - CB Insights is a company database for the venture capital and corporate development community.
Dynamic Yield - Personalization & customer experience management
Owler - Owler is a crowdsourced data model allowing users to follow, track, and research companies.
AB Tasty - AB Tasty is an all-inclusive platform for conversion rate optimization, personalization, customer activation, and testing.