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.
Uxcel - The easiest way to learn UX/UI design
Optimizely - A/B testing you'll actually use.
UX Challenges - Done reading about UX? Start doing it.
Smartlook - Qualitative analytics for websites and mobile apps Start understanding the 'whys' of your users' behaviors with clear, visual insights. With session recordings and event tracking, you get the complete picture.
UI Coach - Become a better UI designer in 30 days