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Open Source CAD In The Browser
(hackaday.com)
This is a most excellent place for technology news and articles.
AFAIK there's only FreeCAD, but it is very different to work with so be prepared to relearn a lot of workflows.
Agreed. It is very powerful but the interface has a long way ahead to be user friendly. Still, it is worth the effort if you really care about sticking to linux.