Shapefest - A massive library of 3D shapes for everything!
Icons8 - Free app for Mac & Windows already containing 39,800 icons. Allows to search and import icons…
Iconscout - Design Resource Marketplace.
clay.css - Micro CSS util class for applying inflated fluffy 3D claymorphism styles to HTML elements.
Craftwork - A collection of User Interface resources made by Craftwork
Khagwal 3D Illustration Library - Free 3D illustration library for web & mobile app designers