Optimizely - A/B testing you'll actually use.
Uxcel - The easiest way to learn UX/UI design
Dynamic Yield - Personalization & customer experience management
UX Challenges - Done reading about UX? Start doing it.
AB Tasty - AB Tasty is an all-inclusive platform for conversion rate optimization, personalization, customer activation, and testing.
UI Coach - Become a better UI designer in 30 days