Mermaid
I was told by a JD Long at a recent conference where I brought up Code2Flow that Mermaid could be used just like Code2Flow within R/Github/etc to draw flowcharts, but it also has other functions that makes it a more generally useful program. Thanks James!
Mermaid is also accessible within R Studio so I can try it here.
Mermaid Live Editor at https://mermaid.live/edit#
Simple Mermaid diagram In R Studio, DiagrammeR would be the package to install for producing Mermaid graphics.
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