What are some alternatives?
IconStore - Free icon packs by first-class designers
AppIconizer - Icon generator for App Store & Play Store submissions.
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!
App Icon Generator - Generate your app icons in milliseconds!
Flaticon - A database of free vector icons.
IconBros - Free and continuously growing high quality icons