Ouch! Illustrations by Icons8 - Professional, perfectly matching, and customizable illustrations for any designs
Now UI Kit - A beautiful Bootstrap 4 UI kit. Yours free.
Control Illustrations - 108 free flat illustrations with customizable characters
Bots UI Kit - Fully customizable Sketch UI Kit for Messenger Platform
Humaaans - Mix-&-match illustrations of humans with a design library.
Landing UI Kit - Handcrafted UI components for landing pages