onboard : An onscreen keyboard useful for tablet PC users and for mobility impaired users ( https://launchpad.net/onboard )
wvkbd : On-screen keyboard for wlroots that sucks less ( https://github.com/jjsullivan5196/wvkbd )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a bell07
For Paludis use this rsync : rsync://gentoo.zugaina.org/bell07-portage
If you have a problem : ycarus(-at-)zugaina.org