node editor:

https://github.com/Ni55aN/D3-Node-Editor
https://github.com/jagenjo/litegraph.js

demo:
  1. place nodes; save to json; parse in haskell
  idea: reactive editing (connection between the editor and the compiler)

  2. visualize compiled lambdacube pipeline

high performance graph visualization:
Sigma.js
http://js.cytoscape.org/

fancy graph visualization:
https://d3js.org/
https://github.com/wbkd/awesome-d3

http://visjs.org/
http://www.chartjs.org/samples/latest/
http://graphalchemist.github.io/Alchemy/#/

purescript:

https://github.com/pelotom/purescript-d3


to choose:

https://constructive.co/insights/6-best-data-visualization-tools-2016-pt-1/
https://constructive.co/insights/6-best-interactive-data-visualization-tools-2016-part-2/
https://www.quora.com/What-is-best-for-graph-rendering-sigma-js-or-d3-js-Why

current choice:
  plotly (based on d3)
  d3-node-editor