Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Optimizely - A/B testing you'll actually use.
Crisp Chat - Multi-channel customer support software
VWO - Use VWO to tweak, optimize & personalize your website with minimal IT help.
Mutiny - Personalize your website for each visitor
AB Tasty - AB Tasty is an all-inclusive platform for conversion rate optimization, personalization, customer activation, and testing.