darktable : A virtual lighttable and darkroom for photographers ( https://www.darktable.org/ )
gmic : GREYC's Magic Image Converter ( http://gmic.eu )
inkscape : SVG based generic vector-drawing program ( https://inkscape.org/ https://gitlab.com/inkscape/inkscape/ )
processing-bin : Visual context programming language ( https://processing.org/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a xira
For Paludis use this rsync : rsync://gentoo.zugaina.org/xira-portage
If you have a problem : ycarus(-at-)zugaina.org