It's not a tool (though there is the Structurizr tool), I like the c4model: http://c4model.com http://c4model.com C4 provides an approach with multiple layers,

It's not a tool (though there is the Structurizr tool), I like the c4model: http://c4model.com http://c4model.com C4 provides an approach with multiple layers, which is good for talking about architecture at different levels with different people. I also happen to like the Container diagram approach.