We are aware that there are many popular graph representation formats. Here we collect format conversion tools that can be run from the command line.
We prefer to write this tools in Deno, a command line version of javascript. Install Deno once to run any of these tools. deno 
Convert to GML popular with gephi and similar apps.
Convert from Sticky Studio as a proof of concept.
Convert from Excalidraw generalizing our methods.
Convert from Miro Board diagrams like sticky.
We provide ready to run versions of these tools as assets served from this website. Click to view source. Version history for each is available. github
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See also Bulk Export and Import