MakeAppIcon - MakeAppIcon resizes and optimizes your icon designs into all formats needed for iOS and Android mobile app!
App Icon Maker - Create icons for mobile app stores online for free.
EasyAppIcon - EasyAppIcon helps you to create your own app icons easily. Supporting Android Adaptive Icon!
Flat Icon Generator - Create stylish, flat icons for Android apps.
Smudge App Icon Generator - Generate your app icons in milliseconds!
ResizePixel - Free image editor to crop, resize, flip, rotate and convert images online