GifGear - How do you make a gif
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.
Gifsicle - Gifsicle is a powerful, simple command line tool for creating, editing, and optimizing animated GIFs.
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
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.