UI Coach - Become a better UI designer in 30 days
Uxcel - The easiest way to learn UX/UI design
Weekly UX Exercise - Receive challenges top companies use to interview designers
UX Challenges - Done reading about UX? Start doing it.
Rage Grade by FullStory - Benchmark your customer frustration
UXsniff - Track user behavior on your website and improve conversions with UXsniff: the user experience watchdog that looks out for you.