GitHub - jooeungen/iMessage-sticker-app-icon-generator: This helps you generate all the necessary app icons for iMessage Sticker project with one command!
Microsoft Apps
EasyAppIcon - Create Mobile App Icon
John Kahn on Twitter: "App Icons Generator & Maker is most use to generate App Icon. It support this type of icon like iOS, iPadOS, macOS. It used the xcasset catalog format.
Asset Creator V4
App Icon Maker - Resize App Icon to all sizes for iOS/Android projects.