UpLabs - The best material design, iOS & web resources, every day
Ouch! Illustrations by Icons8 - Professional, perfectly matching, and customizable illustrations for any designs
Eva Design System - A free customizable design system
Control Illustrations - 108 free flat illustrations with customizable characters
Frames X - Frames X is a design system plus eBook to streamline your design workflow and help save thousands of working hours. With Frames X you will design beautiful interfaces, create great design systems, and stay up to date with the best design practices.
Humaaans - Mix-&-match illustrations of humans with a design library.