no matter which version of this viewer youll choose, playfkiss doesnt only work on win95/98/me but also works great on windows 10 and 11! however theres one thing off about the viewer, unmapped kiss cels will have their colors DITHERED when uploaded to playfkiss ;_;
ultrakiss is way better than other kiss viewers! this viewer has a compatibility mode, ability to search kiss archives by url and more! (highly recommended!)
grafx2 is a cool program that allows you to create pixel art and 256 color palettes! it also allows you to export images to cel files ^_^
gimp is literally linux/gnu photoshop but cheaper and can only export images as probably no other than just cherrykiss (truecolor/24-bit format) cels...
photopea has a free online version and goes perfect with ultrakiss, as ultrakiss supports transparent image formats such as gifs! just copy your element from mspaint, paste to photopea and export as a transparent gif. photopea is AWESOME!!!