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.
IconShock - Over 2 million free icons in 400+ icon sets over 30 styles
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.