The Alien Skin plug-in doesn't work with a graphics program that claims to use Photoshop plug-ins.
We only test and actively support image editors listed on the requirements page for each product. Other image editors might work, but you will have to try them yourself to find out. Simply download the trial version of the product you are interested in and try it. Just keep in mind that we cannot help you diagnose compatibility problems with unsupported image editors.