diod : Distributed I/O Daemon - a 9P file server ( https://github.com/chaos/diod )
mergerfs : Another (FUSE based) union filesystem ( https://github.com/trapexit/mergerfs )
x11fs : Self-syncing tree-merging file system based on FUSE ( https://github.com/sdhand/x11fs )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a mva
For Paludis use this rsync : rsync://gentoo.zugaina.org/mva-portage
If you have a problem : ycarus(-at-)zugaina.org