Space Icons - 77 hand-drawn space icons in multiple graphic versions
Humaaans - Mix-&-match illustrations of humans with a design library.
IconStore - Free icon packs by first-class designers
Control Illustrations - 108 free flat illustrations with customizable characters
Iconjar - Store all your icons in one place, just a click away
Ouch! Illustrations by Icons8 - Professional, perfectly matching, and customizable illustrations for any designs