Visual Blocks for ML is a Google visual programming framework that lets you create ML pipelines in a node and wires graph editor.

Is that node-and-wire editor interface is open source? I might have use for it if I can build my own nodes.

This is what I can find on github https://github.com/google/visualblocks

Strange. The code is just a Python library for adding your own functions to the tool inside Colab, so far as I can tell. I don't know where the code for the user interface is coming from. They mention that it is a combination of a node-and-wire tool, a library of nodes, and a renderer. But I don't see where any of those three things are located.

I wouldn't use this myself looking at the note on the bottom of the readme in this repo: it's not officially supported by google and experimental... and in that regard I think they could improve the communication on the website about this tool

Retejs.org seems like a solid alternative, maybe.

https://github.com/wbkd/react-flow also looks good