https://dokuwiki.librecad.org/doku.php/startLibreCAD capabilities* Partial support of Autodesk DWG format (importing only).
* Support of Autodesk DXF open format (import and export). It is LibreCAD main format.
Both of these are old versions of the format too. You can probably find software to convert lines fairly easily but symbology and layout are often converted poorly.