One of the most complete standalone gif makers with clean user interface.
Pros & Cons:
If you think it is overkill to download a large program for just a GIF animator, then GifApp (also known as Gif Animation GUI Application) is a good alternative.
GifApp is an open source portable app supported by the Sourceforge project and this is the best gif maker I know after Photoscape. You can add multiple images at once, remove images, adjust dimensions, set frame delay, move frames place and can add 17 different effects like dissolve, crystallize, grayscale, invert, etc. You can also import video and make it as a gif, and preview gif as many times as you want before saving. Output gif quality is also quite good.
It is one of the most complete standalone gif maker programs I know about. Its interface is clean and user friendly. You can adjust the size of the interface as you need. The best part is that you don't need any special knowledge for experimenting with it, just add pictures and start making gifs.
GifApp was reviewed by Gizmos Freeware on based on version 1.3.