Optimizely - A/B testing you'll actually use.
Synthesio - Synthesio is a social intelligence tool or a marketing software that is specially made for the purpose of social media monitoring and social analytics.
Dynamic Yield - Personalization & customer experience management
Affise - Affise offers performance marketing solution to manage and analyze affiliates, advertisers, creatives, conversions, offers, and payments.
AB Tasty - AB Tasty is an all-inclusive platform for conversion rate optimization, personalization, customer activation, and testing.
Swift Social - All-in-One Social Media Growth and Management Tool