Avatar Picker - User friendly, in-page avatar changes for your web app
100 Free Userpics - Collection of a hundred free userpics especially for your design projects.
Toy Faces Library - A fun diverse library of 3D avatars for your design mockups.
Bottts - Mix & match robots with a Sketch library
H A N D Z - Free 3D illustrations of diverse hands gestures
Avataaars Generator - A simple avatar generator