Avataaars is a free Sketch Library that allows you to quickly create avatar illustrations. Combine clothes, hair, emotions, accessories, and colors.

Avataaars Generator is a simple web app for generating avatars

The Diversity Avatars collection is an exploration of the beauty and diversity of people and cultures around the world, including all walks of life, religions, and nationalities. UPDATE April 5, 2019 : 750 avatars - https://diversityavatars.com/the-avatars