I've not heard of one.

If you are from a *nix background then there is an old syntax file that I wrote for VIM that is included in the distro - it's a couple of KiXtart versions old and has a couple of bugs due to syntax changes but I still use it daily.

For other examples of KiXtart friendly editors: http://www.kixtart.org/forums/ubbthreads.php?ubb=showflat&Number=118362

If you find that there is KiXtart support in Emacs (or you decide to cobble something together yourself) be sure to post the information.