leksah : Haskell IDE written in Haskell ( http://www.leksah.org )
leksah-server : Metadata collection for leksah ( http://leksah.org )
yi : The Haskell-Scriptable Editor ( https://github.com/yi-editor/yi#readme )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a haskell
For Paludis use this rsync : rsync://gentoo.zugaina.org/haskell-portage
If you have a problem : ycarus(-at-)zugaina.org