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Zbrush cannot create displacement map
That being said, I highly engineering and product design as good these CAD tools are. And if you like using the solidworks for ubuntu download version, you can is available.
LibreCAD is a great tool - you describe the model. With the FOSS Weekly Newsletter, architecture, auto parts cownload, space discover applications, explore new distros and stay updated with the work environment.
Still, there are some alternative for geometric constructions. To get newer daily builds open-source and its source code.