Iconoir is one of the biggest open source libraries with currently 914 SVG Icons. No premium icons, no email sign-up, no newsletters.

550+ Highly customizable free SVG icons (MIT licence) https://github.com/tabler/tabler-icons

A set of over 450 free MIT-licensed high-quality SVG icons for you to use in your web projects. Each icon is designed on a 24x24 grid and a 2px stroke.