Optimizely - A/B testing you'll actually use.
adjust - adjust is a business intelligence platform for mobile app marketers, combining attribution for advertising sources with advanced analytics.
VWO - Use VWO to tweak, optimize & personalize your website with minimal IT help.
Amplitude - Mobile analytics: come with questions, leave with answers
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.
TUNE Marketing Console - The TUNE® Marketing Console unifies measurement across discovery, acquisition, retention, and engagement.