BlendGif is a a GIF animation utility.
BlendGif is used to create animated GIFS.
At it's simplest, BlendGif will combine several single-frame GIF files into a new, animated GIF file.
But that's just the beginning ....
BlendGif's real strength is it's ability to create intermediate images to be used as frames in the animated GIF. These intermediate images allow one to easily create fade, pan, dissolve, and other interesting effects.
Open Source - GNU GPL - Scripts