Freepik - More than a million free vectors, PSD, photos and free icons. Exclusive freebies and all graphic resources that you need for your projects
Humaaans - Mix-&-match illustrations of humans with a design library.
unDraw - Open-source illustrations for every project you can imagine and create.
Handsome Illustrations - Create unique illustrations for websites & applications.
Flaticon - A database of free vector icons.
Blush - Illustrations for everyone