Uxcel - The easiest way to learn UX/UI design
Interfacer - Collection of more than 200+ free design resources
uxtoast: Learn UX Design - Become familiar with design laws and learn how to use them.
Designer Mill - Collection of Best Free Design Resources
Awwwards Academy - Leading thinkers teach digital talent on awwwards academy
Product Disrupt - A design student's list of resources to learn Product Design