IconStore - Free icon packs by first-class designers
Open Peeps - A hand-drawn illustration library.
Streamline icons - The world’s largest icon pack library - 100k icons and illustrations.
Control Illustrations - 108 free flat illustrations with customizable characters
Animated Icons from Icons8 - Massive collection of full-motion animated icons to make your project shine
Handsome Illustrations - Create unique illustrations for websites & applications.