If there was software for automated code diagramming to help me quickly wrap my head around a new codebase, I would buy it instantly (assuming it was licensed l

If there was software for automated code diagramming to help me quickly wrap my head around a new codebase, I would buy it instantly (assuming it was licensed like, say, Sublime Text and not like Adobe Creative Cloud). I keep bookmarking threads like this one, but I haven't found anything useful for me. The closest one was SourceTrail, which is unfortunately not developed anymore. With so much hiring and onboarding going on, I am surprised there isn't a market (or an offering) for such tools.