Lars Magne Ingebrigtsen <larsi(a)gnus.org> writes in xemacs-beta(a)xemacs.org:
I've taken to using flyspell under Emacs 20, and I really like
it.
(It highlights things I've misspelled and stuff.) Has it been ported
to XEmacs (if any porting is needed), and could a package be made for
XEmacs 21?
Unless it has been broken by Emacs integration, it looks like it's
already ported to XEmacs. I've added it to the text-modes packages.