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With the Duplicate button a macro is duplicated with a new name, e.g. duplicate a macro named "MyMacro.FCMacro" and you get a new duplicate file named "MyMacro@001.FCMacro", but the user has opportunity to override the new name with a name of his own or to cancel the operation. Functionality is similar to already existing ability to create copies of the .FCStd file, only for macros, and this must be done manually for each new file. Will be useful to coders mostly. Expected use case could be to save a history of the macro periodically as changes are made or perhaps to duplicate the macro first, and then make changes to the duplicate, eventually replacing the original once satisfied with the changes. New code is based largely on existing code from rename operation, but with QFile.copy() instead of QFile.rename() used, along with other changes needed, such as generating the new suggested filenames. link to forum discussion and demonstration video: https://forum.freecadweb.org/viewtopic.php?f=8&p=254014&sid=98243801791920b69086a3fcd4699e34#p254014 Not sure how to make the Duplicate button label text translate when changing languages.
FreeCAD
FreeCAD is a general purpose feature-based, parametric 3D modeler for CAD, MCAD, CAx, CAE and PLM, aimed directly at mechanical engineering and product design but also fits a wider range of uses in engineering, such as architecture or other engineering specialties. It is 100% Open Source (LGPL2+ license) and extremely modular, allowing for very advanced extension and customization.
FreeCAD is based on OpenCASCADE, a powerful geometry kernel, features an Open Inventor-compliant 3D scene representation model provided by the Coin 3D library, and a broad Python API. The interface is built with Qt. FreeCAD runs exactly the same way on Windows, Mac OSX, BSD and Linux platforms.
Installing
Precompiled (installable) packages are available for Windows and Mac on the Releases page.
On most Linux distributions, FreeCAD is directly installable from the software center application.
Other options are described at the wiki Download page.
Build Status 
| Master | 0.17 | Translation |
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Compiling
Compiling FreeCAD requires installation of several libraries and their development files such as OpenCASCADe, Coin and Qt, listed in the pages below. Once this is done, FreeCAD can be simply compiled with cMake. On Windows, these libraries are bundled and offered by the FreeCAD team in a convenient package. On Linux, they are usually found in your distribution's repositories, and on Mac OSX and other platforms you will usually need to compile them yourself.
The pages below contain up-to-date build instructions:
Usage & Getting help
The FreeCAD wiki contains documentation on general FreeCAD usage, Python scripting, and development. These pages might help you get started:
The FreeCAD forum is also a great place to find help and solve specific problems you might encounter when learning to use FreeCAD.