IconBros - Free and continuously growing high quality icons
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
IconStore - Free icon packs by first-class designers
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
Icon bundles - Largest icon collection by top designers
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.