UI Coach - Become a better UI designer in 30 days
Dynamic Yield - Personalization & customer experience management
Weekly UX Exercise - Receive challenges top companies use to interview designers
Optimizely - A/B testing you'll actually use.
Uxcel - The easiest way to learn UX/UI design
AB Tasty - AB Tasty is an all-inclusive platform for conversion rate optimization, personalization, customer activation, and testing.