Icy - Icy is an open community platform for bioimage informatics
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
ImageJ - and Other Health Care
Ralpha Image Resizer - High-speed image batch conversion tool
JMicroVision - Image analysis toolbox: measuring and quantifying components of high-definition images
Batch Image Resizer - Resize, crop, shrink, flip, exif-rotate, convert, enhance, process multiple pictures and photos with professional software! 120+ Actions, 30+ Image Formats