Swifticons - Premium set of high quality icons in 6 editable styles.
Feather Icons - Simply beautiful open source icons
IconStore - Free icon packs by first-class designers
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!
IconBros - Free and continuously growing high quality icons
SwiftUI Inspector - Export your designs to SwiftUI code