IconStore - Free icon packs by first-class designers
Feather Icons - Simply beautiful open source icons
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!
Iconjar - Store all your icons in one place, just a click away
SwiftUI Inspector - Export your designs to SwiftUI code
Noun Project for Mac - Search nearly a million icons. Now in color!