Looks very nice. Another browser based CAD not mentioned in the article is jscad.

Hmm I’m not sure if this is solid parametric CAD. It let me draw a rectangle and then extrude that giving a zero-width tube… There doesn’t seem to be any way to add dimensions either.

Definitely loads quickly though and feels snappy. But for actually getting stuff done FreeCAD is definitely the best FOSS option at the moment.