Khagwal 3D Illustration Library - Free 3D illustration library for web & mobile app designers
Isometrica - 3D illustration constructor with 380+ isometric objects
Space 3d illustration - Awesome set of 3d illustrations with cosmic characters and different objects.
H A N D Z - Free 3D illustrations of diverse hands gestures
Mesh - Slackoverflow wrapped in a social network
Characterz - Biggest diverse mix and match 3D illustration library