\documentclass{article}
\usepackage{libertine}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\begin{document}
Word1 word2 word3.
\end{document}
Is the following dependency graph (from this website) likely to be made via some LaTeX package? (The tikz package has a dependency package but it does not seem to be suitable for this job.) (Sadly, all the contacts listed in website seem to be long gone.)

tikz-dependencypackage gets you 90% of the way, certainly much better than you could do by hand, so I would work out a minimal example using that package and ask about the specific issue you are having. – Alan Munn May 09 '18 at 16:09