MakeAppIcon - MakeAppIcon resizes and optimizes your icon designs into all formats needed for iOS and Android mobile app!
EasyAppIcon - EasyAppIcon helps you to create your own app icons easily. Supporting Android Adaptive Icon!
Smudge App Icon Generator - Generate your app icons in milliseconds!
App Icon Maker - Create icons for mobile app stores online for free.
Bjango App Icon Templates - App icon templates for PS, Ai, Sketch and Affinity Designer
favicon-generator.org - Generate icons for website and mobile app stores.