Sitecore - Sitecore A/S has produced the Sitecore content management system since 1999.
Dynamic Yield - Personalization & customer experience management
Salesforce Service Cloud - Service Cloud integrates customer service with social networks and provides a self-service customer portal and knowledge base system.
Optimizely - A/B testing you'll actually use.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
AB Tasty - AB Tasty is an all-inclusive platform for conversion rate optimization, personalization, customer activation, and testing.