Clearbit - Clearbit provides Business Intelligence APIs
Optimizely - A/B testing you'll actually use.
ZoomInfo - ZoomInfo is a B2B database providing detailed business information on people and companies.
Evergage - Evergage's real time web personalization software can help you boost engagement, increase revenue and drive more conversions. Web personalization software that's easy to use.
InsideView - InsideView aggregates and curates all the company and contact data, news and social insights, and professional connections you need to do business better.
Google Analytics - Improve your website to increase conversions, improve the user experience, and make more money using Google Analytics. Measure, understand and quantify engagement on your site with customized and in-depth reports.