====== diagram ======
  * [[dia|dia]]
  * [[lucidchart|LucidChart]]
  * [[diagram:diagrams_net|Diagrams.net Draw.io]]
  * [[google:drawings|Google Drawings]]
  * [[diagram:yed|yEd]]
  * [[diagram:graphviz|Graphviz]]
  * [[libreoffice:draw|LibreOffice Draw]]
  * [[uml:plantuml|PlantUML]]
  * [[gliffy|Gliffy]]
  * [[diagram:excalidraw|excalidraw]]