Anima App - Design, get feedback, convert to code, publish, iterate.
Ouch! Illustrations by Icons8 - Professional, perfectly matching, and customizable illustrations for any designs
Sketch Repo - Collection of resources for anyone who uses Sketch
Control Illustrations - 108 free flat illustrations with customizable characters
Auto-Layout for Sketch - Responsive design for Sketch
Humaaans - Mix-&-match illustrations of humans with a design library.