IFC is relevant these days, with IFC you can create a workflow with Revit, AutoCAD Architecture and FreeCAD, if you check in the freeCAD forums, they are trying to create an import-export SH3D format, but they are requesting for help.

link:
https://forum.freecadweb.org/viewtopic.php?t=23965

now that MASSIS is another great BIM software, we need IFC import-export so bad.

I want to help, I have some IFC samples let me know where can I sent.