machi : River WM with cascading windows, horizontal panels, and vertical workspaces ( https://codeberg.org/machi/machi )
rijan : A window manager for the river Wayland compositor ( https://codeberg.org/ifreund/rijan )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a vimproved
For Paludis use this rsync : rsync://gentoo.zugaina.org/vimproved-portage
If you have a problem : ycarus(-at-)zugaina.org