Coffee cup gif animator is pretty good but it doesnt come in freeware, only a trial version.
Gypsee is what I use now and it's freeware but when you want to close it you have to wait 8 seconds. Why? I have no clue but it's not a big problem seeing as how the program is completely free.
Ulead is aight but I'm not sure if it's available in freeware.
If you really want a good animator then make sure you read all the details before downloading it. Some will only let you animate several gif images into one, but what you should look for is a program that will let you animate jpgs and gifs.