Froged - One click solution providing easy-to-use marketing, sales and support services to turn website visitors into happy customers.
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.
Intercom on Customer Engagement - A book on how to create messages that drive engagement
Mixpanel - Mixpanel is the most advanced analytics platform in the world for mobile & web.
Keep Your Friends Close - A free e-book about maximizing Customer Lifetime Value
Matomo - Matomo is an open-source web analytics platform