What are some alternatives?
When comparing Illustrio and IcoMoon, you can also consider the following products
Evie by unDraw - MIT licensed illustrations for your next project
Sketch - Professional digital design for Mac.
DrawKit - MIT licensed SVG illustrations, in 2 styles
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
Flaticon - A database of free vector icons.
Adobe Creative Cloud - Adobe Creative Cloud is a SaaS offering for graphic design, video editing, web development, photography, and cloud services.