Keynote, PowerPoint, or Visio work well for data flow diagrams, flowcharts, and alike. For example, here's mine: https://blog.uidrafter.com/architecture-of-a-de

Keynote, PowerPoint, or Visio work well for data flow diagrams, flowcharts, and alike. For example, here's mine: https://blog.uidrafter.com/architecture-of-a-desktop-alike-spa#-data-flow https://blog.uidrafter.com/architecture-of-a-desktop-alike-s... If you need more UML-like stuff check out https://plantuml.com https://plantuml.com Also, if you get stuck (sometimes it's pointless to diagram the arch as is), try to describe the architecture in sentences and pseudo-code.