Bulk Resize Photos - Resize large photos in bulk
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
ResizePixel - Free image editor to crop, resize, flip, rotate and convert images online
Ralpha Image Resizer - High-speed image batch conversion tool
GIF Resizer - Create animated GIFs and resize GIFs too big to tweet!
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.