Dollo - 300+ mix-and-match components to create your own avatar
Humaaans - Mix-&-match illustrations of humans with a design library.
Boring Avatars - JavaScript library to generates SVG avatars based on text.
Avataaars Generator - A simple avatar generator
Minimal Avatars - Create minimal, unique and playful avatars for free
AVATARZ - Lovely library of diverse 3D avatars