Just wanted to show my support for Spriter. I've been using it on a pretty big Metroidvania game which is almost ready to show. There are some features missing like curves that will hopefully be implemented soon, but it is very capable software. I thought I read Spriter should work in CocoonJS soon too.
Here are some images of my game from an old build. Hope to have some video soon so you can see how fluid Spriter animations are.