A great thing about FreeCAD is that you can add many workbenches in addition to the standard ones. If you create your designs in the Part Design workbench for...
DXF is a very popular file type when you are familiar with CAD. FreeCAD can import DXF files, but you have to change a few settings in the preferences...
I think a lot of you want to create real modeled threads in free CAD software. I made a tutorial video about this and you can watch it on...