A tool I was part of writing (I wrote the Max side while another developer wrote the Blender side).
This tool was developed after a decission was made to transition from using 3DS Max as the main software to using Blender, we had a workflow that had very specific requirements for export which we lost during a pure export-import between max and blender. This tool ensured that we had no data loss and minimum of manual work (this ended up being a one button press solution)