Ralpha Image Resizer - High-speed image batch conversion tool
IcoFX - IcoFX is an all-in-one solution for icon creation, extraction and editing.
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
Icon Slate - Icon Slate lets you easily compose, import and export desktop icons in many formats.
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.
Icono Maker - Icono Maker is an icon maker for Windows.