Open Peeps - A hand-drawn illustration library.
Design Principles - An open source repository of design principles and methods
Control Illustrations - 108 free flat illustrations with customizable characters
UX Research Field Guide - Your map to the world of UX research 🌏🕵️♀️
Humaaans - Mix-&-match illustrations of humans with a design library.
Business-Driven Digital Product Design - A guide on how to create influential user experience