unDraw.co
Open-source illustrations for any idea you can imagine and create.
DrawKit.io
DrawKit is a collection of free, beautiful, customisable MIT licensed SVG illustrations in two styles, to use on your next website, app, or project.
Open Doodles
A Free Set of Sketchy Illustrations
Blush
Illustrations for everyone. Mix-&-match illustrations of people with a design library for InVIsion Studio and Sketch.
Humaaans
Mix-&-match illustrations of people with a design library for InVIsion Studio and Sketch.
If you know of any interesting and useful tools that haven't been listed above send it to me
