Humaaans - Mix-&-match illustrations of humans with a design library.
Humanotion - Free avatar pack, perfect for Notion
Diversity Avatars - Diversity avatar icons that celebrates humanity
Open Peeps - A hand-drawn illustration library.
TinyFaces - Free crowd-sourced avatar gallery including Sketch plugin
Toy Faces Library - A fun diverse library of 3D avatars for your design mockups.