ezgif.com - Ezgif.com is simple online gif maker and toolset for basic animated gif editing.
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
Instagiffer - Create GIFs from anything!
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
Gifsicle - Gifsicle is a powerful, simple command line tool for creating, editing, and optimizing animated GIFs.
Ralpha Image Resizer - High-speed image batch conversion tool