Avatar Picker - User friendly, in-page avatar changes for your web app
Anima App - Design, get feedback, convert to code, publish, iterate.
100 Free Userpics - Collection of a hundred free userpics especially for your design projects.
Sketch Repo - Collection of resources for anyone who uses Sketch
Bottts - Mix & match robots with a Sketch library
Auto-Layout for Sketch - Responsive design for Sketch