What are some alternatives?
When comparing Stubborn Illustrations and Illustration Tools, you can also consider the following products
Evie by unDraw - MIT licensed illustrations for your next project
Marketing Inspo - Get inspired by this collection of marketing examples.
DrawKit - MIT licensed SVG illustrations, in 2 styles
Blush - Illustrations for everyone
Handsome Illustrations - Create unique illustrations for websites & applications.
Interfacer - Collection of more than 200+ free design resources