by DWG TOOL Software DWG Converter - Batch Convert DWG DXF DWF to PDF WMF BMP JPEG GIF PLT SVG CGM EPS, and also enable the conversion between DXF and DWG file versions (R2.5-R2006).
by AutoDWG DWF Importer(a.k.a. DWG to DWF Converter) is An AutoCAD Addin let you import dwf file into AutoCAD. It supports AutoCAD 2005, 2004, 2002, 2000(i) and R14.
by DWF to DWG DWF to DWG converts DWF files to AutoCAD DWG and DXF file formats, you can recover DWF entities to corresponding DWG entities easily. It supports the DWF layers, multi-page specification and all entity types.