MakeAppIcon - MakeAppIcon resizes and optimizes your icon designs into all formats needed for iOS and Android mobile app!
Polarr Photo Editor 3 - The most powerful photo editor in the web.
EasyAppIcon - EasyAppIcon helps you to create your own app icons easily. Supporting Android Adaptive Icon!
Bulk Resize Photos - Resize large photos in bulk
App Icon Maker - Create icons for mobile app stores online for free.
IMG.LY - Power Your Apps with IMG.LY | The Leading Provider of Design, Photo, and Video Editing SDKs