Sure. https://spritestack.io/ Just click NEW SPRITE or ONLINE button :)
I tried that but it doesn't work. When I make a new frame and move or rotate something, all of the frames are changed to it's new location/rotation. Is this a bug?
Edit: Seems it works when rotating, just not when moving.
Edit 2: Is it okay if I post some bug reports here? The feedback forums only allow 2 posts a day, which isn't very much.