josm : Java-based editor for the OpenStreetMap project ( http://josm.openstreetmap.de/ )
mkgmap : Tool to create garmin maps ( http://wiki.openstreetmap.org/index.php/Mkgmap )
splitter : Tool to split garmin maps ( http://www.mkgmap.org.uk/page/tile-splitter )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a otih
For Paludis use this rsync : rsync://gentoo.zugaina.org/otih-portage
If you have a problem : ycarus(-at-)zugaina.org