IconStore - Free icon packs by first-class designers
Android Icons - Androidicons is a professional, handcrafted icon set with 250 icons in 14 different colors and 5 sizes, including an icon font and all sources.
Fluent Icons by Icons8 - Colorful and stylish icons for your projects
Linea.io - Personalizing the icons of your PC or your website is a fun way to spruce up the appeal. You can use better Icons instead of the regular boring folders.
Heroicons - Beautiful, free SVG icons from the makers of Tailwind CSS.
Octicons - Your project. GitHub's icons.