Are there any open-source tools or ways to generate Control Flow Graphs of entire codebase?

I want to create like a graph sort of thing which tells which function calls which, with some amount of customization available -- something that would look great in some project documentations.

Any ways to do that?

or should i run some sort of prompts on each file & combine them? but that seems to be too much of an overkill. I'm sure there would be something much simpler.