Isometrica - 3D illustration constructor with 380+ isometric objects
Humaaans - Mix-&-match illustrations of humans with a design library.
Struct Illustrations - Create your own unique story with editable illustrations
Control Illustrations - 108 free flat illustrations with customizable characters
BAM Free 3D Illustration Kit - More than 30 high quality 3D icons, free to use.
Ouch! Illustrations by Icons8 - Professional, perfectly matching, and customizable illustrations for any designs