A Product Design Challenge - Get a design challenge to solve real-world problems
Interfacer - Collection of more than 200+ free design resources
Frontend Mentor - Supercharge your front-end skills by building in a real-life workflow. Solve real-world HTML, CSS and JavaScript challenges whilst working to professional quality designs.
Facebook Design Resources - A collection of free resources made by designers at Facebook
User Inyerface - A painful illustration of bad UX
Freebiesbug - Collection of the best free web design resources.