AbTest.io - A free url shortener with A/B testing features
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.
PreFlight - Preflight is an Automated Web Testing tool. Allows everyone to automate Web UI tests.
Adobe Analytics - Adobe Analytics is an industry-leading solution that empowers you to understand your customers as people and steer your business with customer intelligence.
GoodUI Fastforward - Lift your conversion rate with repeatedly AB tested patterns
Mixpanel - Mixpanel is the most advanced analytics platform in the world for mobile & web.