Humanotion - Free avatar pack, perfect for Notion
Humaaans - Mix-&-match illustrations of humans with a design library.
Minimal Avatars - Create minimal, unique and playful avatars for free
TinyFaces - Free crowd-sourced avatar gallery including Sketch plugin
Boring Avatars - JavaScript library to generates SVG avatars based on text.
Bottts - Mix & match robots with a Sketch library