draw.io guide

BookStack has support for draw.io which adds quite a few useful features.

One of which is generating UML diagrams from Plant UML or Graphviz

Formatting looks something like this

@startdot
digraph UMLdiagrams {
....
}
@enddot

Yosys happens to be able to generate schematics as a DOT file, so this can be useful for any projects that use (System)Verilog.

draw.io also has electrical symbols so it can be used to create simple schematics.