Optimizely - A/B testing you'll actually use.
ChatWhale - Gamify your customer communication and loyalty rewards
VWO - Use VWO to tweak, optimize & personalize your website with minimal IT help.
Open Loyalty for Startups - Open source stack for building customer focused products
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.
Reviews for iOS - Keep track of your App Store reviews