PlantUML
PlantUML “PlantUML is used to draw UML diagrams, using a simple and human-readable text description. Be careful, because it does not prevent you from drawing inconsistent diagrams (such as having two classes inheriting from each other, for example). So it’s more a drawing tool than a modelling tool.” - PlantUML.org
Diagrams C4 Model The C4 model is a lean graphical notation technique for modeling the architecture of software systems. It is based on a structural decomposition (a hierarchical tree structure) of a system into containers and components and relies on existing modelling techniques such as Unified Modeling Language (UML) or entity–relationship diagrams (ERDs) for the more detailed decomposition of the architectural building blocks.
