IconStore - Free icon packs by first-class designers
Ralpha Image Resizer - High-speed image batch conversion tool
Feather Icons - Simply beautiful open source icons
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
Streamline icons - The world’s largest icon pack library - 100k icons and illustrations.
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.