is a visual editor for Dataflow programming
Demo

With npm do
npm install flow-view
Try this in your HTML page
<script type="importmap">
{ "imports": { "flow-view": "https://unpkg.com/flow-view" } }
</script>
<script type="module">
import { defineFlowViewCustomElements } from 'flow-view';
addEventListener('load', () => {
defineFlowViewCustomElements();
});
</script>