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Might I ask, why exactly do you feel the need to have a webapp for CAD rather than a hard client?
Check out Kasm too, you can easily install blender into it.
Freecad in a VM with a remote viewer like guacamole?
Ideally you could use moonlight but that is not web based
Would love to learn if it exists too. I use it often.
The only other way I know how to CAD is https://github.com/pythonscad/pythonscad
There is also Cascade Studio (Demo). Sadly development has stalled, it was a really cool project.
Probably not at all what OP is looking for though since TinkerCAD is just sketch/primitive type workflow, not like openscad.