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.