What are some alternatives?
When comparing Stubborn Illustrations and Marketing Inspo, you can also consider the following products
Evie by unDraw - MIT licensed illustrations for your next project
Illustration Tools - Directory of tools and resources for illustrators
DrawKit - MIT licensed SVG illustrations, in 2 styles
SaaSFrame - Browse hundreds of SaaS marketing pages, product interfaces and email flows.
Handsome Illustrations - Create unique illustrations for websites & applications.
Blush - Illustrations for everyone