I used mermaid for https://basisrobotics.tech/2024/11/24/basis-robot-02-softwar... (autogenerated) and it worked out pretty well, but notably I wasn't trying to handle loops. There have to be mermaid to png renderers out there. Beyond that, I view svg/html output as a huge advantage - I can restyle it and it's copyable.
Mermaid is great in its niche, and being web-first has been its greatest asset. But that is also a great frustration because anytime I try to do anything out of the web-world with mermaid, it becomes a massive PITA thanks to needing a full headless browser.
I used graphviz to generate graphs for code structures, and that worked out great.
https://niravko.com/blog/visualize-cpp-data-structures#resul...