Icons8 - Free app for Mac & Windows already containing 39,800 icons. Allows to search and import icons…
Isometrica - 3D illustration constructor with 380+ isometric objects
150+ Free Illustrations & Animations - MIT Licensed to use for free in your next commercial project
Characterz - Biggest diverse mix and match 3D illustration library
Wannathis - 3d illustrations and freebies
Khagwal 3D Illustration Library - Free 3D illustration library for web & mobile app designers