Optimizely - A/B testing you'll actually use.
Apptimize - Mobile A/B Testing for iOS and Android. Improve Your Native App Codelessly in Real-time.
VWO - Use VWO to tweak, optimize & personalize your website with minimal IT help.
Taplytics - Mobile A/B testing for everyone. With the world's most fully featured mobile A/B testing platform.
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.
Artisan - The all-in-one platform for analytics, A/B testing, personalization, and marketing automation.