DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
digiKam - Professional Photo Management with the Power of Open Source
Ralpha Image Resizer - High-speed image batch conversion tool
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.