I'd like to start a discussion regarding RPM groups and desktop
categories for CAD/CAM software.
1) CAD software, like OpenSCAD, FreeCAD, LibreCAD etc
For RPM groups, we obviously have Productivity/Graphics/CAD 
For desktop categories, there is no obvious choice. Some packagers use
Graphics;3DGraphics or Graphics;2DGraphics but it seems wrong, because
this way CAD software ends up in the same place as GIMP, digikam,
gwenview and these two types of application have very little in common.
Looking in the Freedesktop spec , the correct category for CAD is
"Engineering", but our guidelines  allow Engineering only in
"Science" or "Education", and both seem wrong in this case.
2) CAM software, like Cura, Slic3r, Printrun etc
Here the situation is basically hopeless, as there is neither RPM group
nor desktop category suitable for CAM software.
For RPM groups, Fedora  uses Application/Engineering, but our
guidelines  do not allow it.
For desktop categories, one could use the "Engineering" in "Science"
"Education" but just like with CAD it seems like a stretch.
 openSUSE groups:
 Fedora groups: https://fedoraproject.org/wiki/RPMGroups
 openSUSE categories:
 Freedesktop categories:
We advertise as openSUSE as "The makers' choice...", so I hope we could
address these concerns, as they affect software typically used by
makers. It's a bit funny we (and Freedesktop) have a designated category
for Spirituality software, but not for 3D printing :)
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