Sitecore - Sitecore A/S has produced the Sitecore content management system since 1999.
Optimizely - A/B testing you'll actually use.
Salesforce Service Cloud - Service Cloud integrates customer service with social networks and provides a self-service customer portal and knowledge base system.
SplitMetrics - SplitMetrics is the A/B testing platform for App Store and Google Play page to discover the most converting icons, screenshots, video, etc.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Intellimize - Convert more. Optimize and personalize for every website visitor.