Foundry
Foundry offers a great selection of open source SVG illustrations, created by the designers at thoughtbot. Free to use on your next project.
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Ouch!
Ouch! offers free vector illustrations for user interface, created by Icons8. These illustrations give a clean, trendy look to your designs.
DrawKit
DrawKit is a collection of free, beautiful, customisable MIT licensed SVG illustrations in two styles, to use on your next website, app, or project.
Humaaans
Mix-&-match illustrations of people with a design library, easily customizable. Free for commercial or personal use, created by Pablo Stanley.
IRA Design
Create amazing illustrations by using hand-drawn sketch components. IRA Design offers a cool selection of 5 gradients and the ability to use ai., svg. or png. formats.