GIFmaker - GIFmaker gives you the freedom and flexibility to create unique, professional GIFS that are on-brand, on your own!
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
GIPHY Says - Turn your words into animated GIFs!
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
GifJif - Turn GIFs into masterpieces.
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.