Open Peeps - A hand-drawn illustration library.
Canva - Canva is a graphic-design platform with a drag-and-drop interface to create print or visual content while providing templates, images, and fonts. Canva makes graphic design more straightforward and accessible regardless of skill level.
Control Illustrations - 108 free flat illustrations with customizable characters
Dark Room - A quick, powerful photo editor that gives you control
DrawKit - MIT licensed SVG illustrations, in 2 styles
Phonto - Text on Photos