From Wikipedia: (https://en.wikipedia.org/wiki/FreeCAD) “FreeCAD is a free and open-source (under the LGPLv2+ license) general-purpose parametric 3D CAD modeler. FreeCAD is aimed directly at mechanical engineering and product design but also fits in a wider range of uses around engineering, such as architecture or other engineering specialities. FreeCAD is currently in a beta stage of development.”

A common issue is “NO_PUBKEY 005EAE8119BB5BCA”, no pubkey available.

This command is a workaround for this issue:

# sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 005EAE8119BB5BCA

Now you can install FreeCAD PPA as usual:

# sudo apt-add-repository ppa:freecad-maintainers/freecad-daily
# sudo apt-get update
# sudo apt install freecad

• Official website: http://freecadweb.org/