> are there any helper tools for the pkgsrc package collection? I am looking
> for:
> 1. something like pkg_cutleaves in FreeBSD or debfoster in Debian. A tool,
> which asks for every 'leaf-package' (a package, on which no other package
> depends on) if it should be kept or removed, recursing down, when
> nessecary. Very useful for finding packages that were at some time
> installed to satisfy dependencies
> 2. something like portupgrade in FreeBSD. A tool, which lets me easily
> upgrade/install packages.
> Possibly these things can also be accomplished by a make something in pkgsrc?

Have a look at pkgsrc/pkgtools/*; there are tools like pkgchk to upgrade
the installed pkgs as in FreeBSD via portupgrade.