I'm not sure what kind of format your graphics need to be in when you're making games, but my current project requires strip animations--as if a flipbook's pages were laid side by side in a single row.
If you do too, then this program that I wrote might be useful to you. It takes a regular gif animation and turns it into a single strip and outputs it to a standard image file of your choosing. It's also very easy to use and indexes and optimizes gifs. I don't know if anyone will find this useful, but I figured I'd put it out here for my fellow game makers to use.
It's all open source too so you can take a peek under the hood.
http://devblog.projectmoldering.com/post/2601153326/cutting-up-gifs-into-strips