Google Design Sprint Kit - Your resource for planning and running a Design Sprint
Ouch! Illustrations by Icons8 - Professional, perfectly matching, and customizable illustrations for any designs
FlowMapp - FlowMapp is a UX planning tool for creating visual sitemaps and user flow.
Control Illustrations - 108 free flat illustrations with customizable characters
Craftwork - A collection of User Interface resources made by Craftwork
Humaaans - Mix-&-match illustrations of humans with a design library.