Design Principles - An open source repository of design principles and methods
Ouch! Illustrations by Icons8 - Professional, perfectly matching, and customizable illustrations for any designs
UX Research Field Guide - Your map to the world of UX research 🌏🕵️♀️
Control Illustrations - 108 free flat illustrations with customizable characters
Business-Driven Digital Product Design - A guide on how to create influential user experience
Humaaans - Mix-&-match illustrations of humans with a design library.