Although we haven't really drawn attention to it by providing samples or SDK documentation, all of Cyotek's products are extensible in various ways. As long as you can code in a .NET language and can work with the API each product provides that is.
Cyotek's Gif Animator is no exception. The currently released version supports the same level of "standard" add-ins that other products include, and the development version now includes a new experimental image effects plugin system too.