Shrink O'Matic - Shrink O'Matic is an AIR application to easily (batch) resize (shrink) images.
Ralpha Image Resizer - High-speed image batch conversion tool
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
ImageOptim - Faster web pages and apps.
Mass Image Compressor - Mass Image Compressor is easy to use - a point and shoot batch image compressor and converter tool for Web site optimization, photographers, HTML game creator and casual Windows users.