pkgdepgraph prints out a "dot" language specification of the inter-dependencies of your installed packages. The "dot" language is interpreted by the graphviz package to make graphs. There are several uses for such information. (1) A graphical representation of information is always good to look at. (2) The output itself can be sorted and filtered to provide a list of packages to delete in order that they can be rebuilt (to replace out-of-date components). (3) You can visually estimate the work involved in (or impact of) removing a given component in order to replace it.
Binary packages can be installed with the high-level tool pkgin (which can be installed with pkg_add) or pkg_add(1) (installed by default). The NetBSD packages collection is also designed to permit easy installation from source.
The pkg_admin audit command locates any installed package which has been mentioned in security advisories as having vulnerabilities.
Please note the vulnerabilities database might not be fully accurate, and not every bug is exploitable with every configuration.
Problem reports, updates or suggestions for this package should be reported with send-pr.