There are a few available softwares. One of them would be
Macromedia. Flash is commonly used. Fireworks can also do the
job.
Anther one would be Adobe Photoshop.
If you want it to be simple without having to learn how to use
these softwares, there are GIF animators around. Just download them
and you can do the effects. But they won't be as nice as you use
Flash or Photoshop to do it. They are all simple effects.
