Interfacer - Collection of more than 200+ free design resources
Little Big Details - Your daily dose of design inspiration
Facebook Design Resources - A collection of free resources made by designers at Facebook
Clear labels by Sticker Mule - Label your products with a premium 'no label' look
Freebiesbug - Collection of the best free web design resources.
Awwwards - Awwards focuses on web design and has an awards system that highlights exceptional design.