I provide a link to a program I use, however there are many out there with similar functions. NOTE: Paint.NET does NOT support animated images! This means another program will have to be downloaded in addition. If you're using the plugin, instead of saving files individuals, just place them on different layers (first on the bottom). While this tutorial may be outdated as far as the method goes, the concept still applies. NOTE: A plugin now exists for making animating.
