HowtoDirectedGraphs has a basic howto on creating directed graphs using dot.
The below examples show some of the capabilities of the DirectedGraphPlugin
This is a typical example of a component architecture drawing (This kind of graph is also easy to do in Foswiki:Extensions.JHotDrawPlugin if you like the look but you prefer to draw it manually using your mouse).
Click the [dot] link located below the diagram to view the input. Note that this example is an inline SVG with fallback to PNG
This type of graph can also easily be extended, for instance making network nodes clickable, pointing to asset databases or similar.
Click the [dot] link below the diagram to view the input.