Ouch! Illustrations by Icons8 - Professional, perfectly matching, and customizable illustrations for any designs
Doodle Ipsum - Doodle Ipsum is a free illustration tool for devs powered by Blush!
Control Illustrations - 108 free flat illustrations with customizable characters
Illustration Kit - Premium open source illustrations updated daily
Humaaans - Mix-&-match illustrations of humans with a design library.
Struct Illustrations - Create your own unique story with editable illustrations