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!
Heroicons - Beautiful, free SVG icons from the makers of Tailwind CSS.
The Noun Project - Creating, Sharing and Celebrating the World's Visual Language
Animaticons - Beautiful, customizable animated GIF icons.
IcoMoon - IcoMoon is an icon management tool that is build to provide iconography.
Fluent Icons by Icons8 - Colorful and stylish icons for your projects