Illustrio is described as 'customizable image library for non-designers, the library that adapts to your own colors, text and data. Illustrio is ideal for your presentations, newsletter and online publishing' and is an website in the Photos & Graphics category. There are more than 10 alternatives to Illustrio, not only websites but also apps for a variety of platforms, including Self-Hosted solutions, Mac, Windows and Linux. The best alternative is Font Awesome, which is both free and Open Source. Other great sites and apps similar to Illustrio are Flaticon (Freemium), Fork Awesome (Free, Open Source), Line Awesome (Free) and Tabler Icons (Free, Open Source).
Premium designed free icon set with marks in SVG, Webfont and raster formats. CoreUI Icons are beautifully crafted symbols for common actions and items. You can use them in your digital products for web or mobile app.
Swifticons is a remarkable premium set of 2104 high quality icons, capable of covering 19 wide categories in 4 editable styles: outlined, filled, colored & flat. Swifticons is used by creatives, designers and developers.
Iconoir is one of the biggest open source libraries with currently 914 SVG Icons. No premium icons, no email sign-up, no newsletters. You can download any icon of the pack directly from https://iconoir.com or get them from the repository.