In general, we use /opt for those.
treecleaner: Anyone care to save this thing? Upstream URI doesn't work anymore either, and being unversioned like that doesn't seem wise.
# Jeremy Olexa <darkside@gentoo.org> (3 Jul 2009) # binpkg that installs into /usr, no Gentoo maintainer, QA removal in 60 days # unless someone properly packages this one. bug 240768 net-dns/dns2go
gone