ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
OpenToonz - OpenToonz is an animation program that is a free software version of Toonz, the animation software...
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
Synfig Studio - Just another WordPress site
Ralpha Image Resizer - High-speed image batch conversion tool
Blender - Blender is the open source, cross platform suite of tools for 3D creation.