Shapefest - A massive library of 3D shapes for everything!
Craftwork - A collection of User Interface resources made by Craftwork
PixCap - A browser-based 3D animation editor and assets library.
Icons8 - Free app for Mac & Windows already containing 39,800 icons. Allows to search and import icons…
Wannathis - 3d illustrations and freebies
404 Illustrations - Open-source catchy illustrations for perfect error pages