What are some alternatives?
When comparing Retrowave Illustration Pack and Atlassian Design, you can also consider the following products
Stubborn Illustrations - 30 little exciting stories from the startup world
Design Principles - An open source repository of design principles and methods
Stories by Freepik - Awesome illustrations for your next project
Product Disrupt - A design student's list of resources to learn Product Design
Illustration Tools - Directory of tools and resources for illustrators
ManyPixels - Unlimited, on-demand design services for freelancers, startups, and agencies.