Have you updated your repository?
FreeCAD seems to be there. Also, FreshPorts reports that a FreeCAD package is available for FreeBSD 13.0 on the amd64 and aarch64 architecturesCode:root@kg-vm5:~ # freebsd-version -ku 13.0-RELEASE-p1 13.0-RELEASE-p2 root@kg-vm5:~ # pkg search freecad FreeCAD-0.19.1 General purpose 3D CAD modeller
Ah, I see. My old DELL Inspiron 6400 is an i386 only.