What are some alternatives?
When comparing Illustrio and Evie by unDraw, you can also consider the following products
DrawKit - MIT licensed SVG illustrations, in 2 styles
Flaticon - A database of free vector icons.
Humaaans - Mix-&-match illustrations of humans with a design library.
IconPharm - IconPharm is a library of open source icons with recoloring and resizing tools.
Carrd - Simple, responsive one-page site creator.
Font Awesome - Font Awesome makes it easy to add vector icons and social logos to your website. And version 5 is redesigned and built from the ground up!