Boring Avatars - JavaScript library to generates SVG avatars based on text.
TinyFaces - Free crowd-sourced avatar gallery including Sketch plugin
Union Avatars - 3D Realistic Avatar Maker with a single selfie
Humaaans - Mix-&-match illustrations of humans with a design library.
Avataaars Generator - A simple avatar generator
Avatar SDK - AI-powered 3D avatars from one photo