Ouch! Illustrations by Icons8 - Professional, perfectly matching, and customizable illustrations for any designs
Twitter Polls - Polls embedded in tweets
Control Illustrations - 108 free flat illustrations with customizable characters
Simple Poll - The easiest way to create polls in Slack
Humaaans - Mix-&-match illustrations of humans with a design library.
Curious Polls - Answer a question once a day for the chance to win £100/$100