GIF Resizer - Create animated GIFs and resize GIFs too big to tweet!
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
GifLab - The easiest way to create GIFs on your iOS device
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
Cast - Record, edit, publish, and host your podcast
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.