Foundry offers a great selection of open source SVG illustrations, created by the designers at thoughtbot. Free to use on your next project.
10+ Free absurd illustrations that make sense in .png format. Take every user on an individual journey through their own imagination.
An updated and customizable collection of beautiful SVG illustrations that you can use completely free and without attribution.
Mix-&-match illustrations of people with a design library, easily customizable. Free for commercial or personal use, created by Pablo Stanley.