Control Illustrations - 108 free flat illustrations with customizable characters
Coronavirus Press Kit - Browse or create your own Covid-19 stock photos for free
Ouch! Illustrations by Icons8 - Professional, perfectly matching, and customizable illustrations for any designs
IconStore - Free icon packs by first-class designers
Flaticon - A database of free vector icons.
Covid-19 Design Pack by Artify - Free set of COVID-19 design materials u can edit on the fly