App Icon Maker - Create icons for mobile app stores online for free.
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
EasyAppIcon - EasyAppIcon helps you to create your own app icons easily. Supporting Android Adaptive Icon!
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
MakeAppIcon - MakeAppIcon resizes and optimizes your icon designs into all formats needed for iOS and Android mobile app!
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.