Uxcel - The easiest way to learn UX/UI design
Instabug - The top apps in the world rely on Instabug for beta testing, user engagement and crash reporting.
uxtoast: Learn UX Design - Become familiar with design laws and learn how to use them.
UserTest.io - User testing made simple. High-quality, affordable user testing solutions from real users, here in the UK. Improve your usability!
Awwwards Academy - Leading thinkers teach digital talent on awwwards academy
UserTesting.com - Usability testing has never been easier. Get videos of real people speaking their thoughts as they use websites, mobile apps, prototypes and more!