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Software for jewellery designing on linux?
(feddit.ch)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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I'll add my +1 for FreeCAD. It can export to stl (you mentioned that in another comment). Though, if it is a good fit for your father's needs is highly dependent on the kind of designs he's trying to achieve. FreeCAD is good for "geometric" designs, not so good for "organic" shapes. As any tool, it comes with a learning curve.