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.
IconsExtract - Extract icons and cursors stored in EXE, DLL, OCX, CPL files
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
JDraw - Open Source SF.net
Ralpha Image Resizer - High-speed image batch conversion tool