Someone posted this https://webvm.io/alpine.html in another community and it made me think of this post. I’ve never used webvm and I suspect there are many downsides but seemed relevant and the demo seems to be able to run a full desktop environment. You have to find a CAD software that supports Linux though which is a controversial topic at best.

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.

The really hilarious thing to me is that the NextPush app (unified push provider that can be run on your nextcloud server) is unsupported by nextcloud talk. But it is supported by a bunch of other competing applications.