VWO - Use VWO to tweak, optimize & personalize your website with minimal IT help.
Sensor Tower - Sensor Tower is a platform for app store optimization and app industry intelligence.
Optimizely - A/B testing you'll actually use.
42matters - 42matters offers top-notch app market data and audience data that helps you to build your business around mobile. All mobile data is easily accessible via our REST API and easy to use Explorer.
Crazy Egg - Through Crazy Egg's heat map and scroll map reports you can get an understanding of how your visitors engage with your website so you can boost your conversion rates.
Mobile Action - Mobile Data Intelligence & Actionable Insights.