Humaaans
Mix-&-match illustrations of people with a design library, easily customizable. Free for commercial or personal use, created by Pablo Stanley.
Related Tools

Ouch!
Ouch! offers free vector illustrations for user interface, created by Icons8. These illustrations give a clean, trendy look to your designs.

Absurd Design
10+ Free absurd illustrations that make sense in .png format. Take every user on an individual journey through their own imagination.

DrawKit
DrawKit is a collection of free, beautiful, customisable MIT licensed SVG illustrations in two styles, to use on your next website, app, or project.

unDraw
An updated and customizable collection of beautiful SVG illustrations that you can use completely free and without attribution.