Bjango App Icon Templates - App icon templates for PS, Ai, Sketch and Affinity Designer
ResizePixel - Free image editor to crop, resize, flip, rotate and convert images online
Flat Icon Generator - Create stylish, flat icons for Android apps.
EasyAppIcon - EasyAppIcon helps you to create your own app icons easily. Supporting Android Adaptive Icon!
favicon-generator.org - Generate icons for website and mobile app stores.
Smudge App Icon Generator - Generate your app icons in milliseconds!