I invite you to add https://polygonjs.com, which is fully node-based (I'm the author). You can create procedural geometry, shaders, behaviors, with just nodes.

It is inspired by Houdini/Nuke/Unreal. The main engine is open source ( https://github.com/polygonjs/polygonjs ) and there are more and more examples ( https://polygonjs.com/examples/ )

(edit - oh, it was already there! thank you!)