Docagrams is a DocService extension to the Markista markdown doclet that produces Java module and directury structure diagrams in SVG format.
Docagram's source is available from its GitHub repository, and binaries are available on its releases page.
When running Markista as your Javadoc doclet, ensure the Docagrams JAR file is in your module path. That's it - Markista will automatically load and run it. Diagrams will be written to a diagrams folder inside your project's documentation folder.
Docagrams produces three diagrams. Samples are shown below.