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Matt York
Pflow is an open source Golang tool for working with Petri-Net models.
Pflow supports live-editing and exporting models to HTML formatted docs.

For Developers, an internal Domain Specific Langauges (DSL) allows for nets to be declared in JS or Lua.
Pflow Petri-Net Editor
Pflow Petri-Net Editor
Construct and visualize Petri-Nets using JS or Lua