DesignMunk - Landing Page Inspirations
Humaaans - Mix-&-match illustrations of humans with a design library.
SiteSee - Curated gallery of beautiful, modern websites.
Control Illustrations - 108 free flat illustrations with customizable characters
Muzli - UI/UX and Design Inspiration Chrome Extension
Ouch! Illustrations by Icons8 - Professional, perfectly matching, and customizable illustrations for any designs