GitHub repo: https://github.com/graphscad/graphscad
Dimitri Kolovitz's profile on Thingiverse: https://www.thingiverse.com/kolovitz/designs
Dimitri Kolovitz's profile on Thingiverse: https://www.thingiverse.com/kolovitz/designs
Also here is Node Graph Interace to OpenSCAD in Java.[1]
FTR, I may recommend take a look on VisualScriptCAD[2] and DynFreeCAD[3].
[0] https://forum.openscad.org/Graphscad-A-New-Nodal-editor-for-...
[1] https://github.com/studiotc/NodeGraphInterface