Humanotion - Free avatar pack, perfect for Notion
Avataaars Generator - A simple avatar generator
TinyFaces - Free crowd-sourced avatar gallery including Sketch plugin
AREX - AREX is an invoice financing exchange, where small and medium-sized business can sell their unpaid invoices to boost their cash flow.
Boring Avatars - JavaScript library to generates SVG avatars based on text.
Humaaans - Mix-&-match illustrations of humans with a design library.