Drawing flow diagrams and UML diagrams

Tags

1. plantuml
2. ditaa
3. Mermaid
   1. Use Mermaid playground to view diagrams
   2. The VS Code live-preview plugin is awesome (Are there live preview plugins for plantuml or ditaa?)
   3. https://mermaid.js.org/
   4. https://mermaid.js.org/syntax/entityRelationshipDiagram.html