Control Illustrations - 108 free flat illustrations with customizable characters
Icons8 - Free app for Mac & Windows already containing 39,800 icons. Allows to search and import icons…
Humaaans - Mix-&-match illustrations of humans with a design library.
Open Peeps - A hand-drawn illustration library.
Blush - Illustrations for everyone
Craftwork - A collection of User Interface resources made by Craftwork