AbTest.io - A free url shortener with A/B testing features
Optimizely - A/B testing you'll actually use.
Zarget - Zarget is new age AB testing and Heatmap software that lets you optimize your website with just a few clicks thereby increasing sales.
VWO - Use VWO to tweak, optimize & personalize your website with minimal IT help.
A/B Rankings - 🚀 Split testing for your SEO traffic
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.