OpenTabletDriver : A cross-platform open-source tablet driver ( https://opentabletdriver.net/ )
OpenTabletDriver-bin : Cross platform tablet driver (binary package) ( https://github.com/OpenTabletDriver )
evdi : Extensible Virtual Display Interface ( https://github.com/DisplayLink/evdi )
xf86-input-xppen : Driver for XP-PEN tablets and drawing devices ( https://www.xp-pen.com )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a guru
For Paludis use this rsync : rsync://gentoo.zugaina.org/guru-portage
If you have a problem : ycarus(-at-)zugaina.org