I like using https://c4model.com/ https://c4model.com/ - the Level 2 diagram is particularly useful. I use https://mermaid-js.github.io/mermaid/#/ https://merm

I like using https://c4model.com/ https://c4model.com/ - the Level 2 diagram is particularly useful. I use https://mermaid-js.github.io/mermaid/#/ https://mermaid-js.github.io/mermaid/#/ for the diagram itself because Github natively supports it in markdown files, so you can revision control the diagram. I managed to get reasonably close to the C4 diagrams minus a few features that mermaid does not support.