Optimizely - A/B testing you'll actually use.
Uxcel - The easiest way to learn UX/UI design
VWO - Use VWO to tweak, optimize & personalize your website with minimal IT help.
UX Challenges - Done reading about UX? Start doing it.
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.
UI Coach - Become a better UI designer in 30 days