DWG DXF Converter 

DWG DXF Converter is a batch DWG and DXF bi-directional converter that allows you to convert DWG to DXF, DXF to DWG without the need of AutoCAD. It is also an AutoCAD drawing file version converter.
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DwgConverter 

A batch converter tool that converts DWG/DXF R2.5 ~ R2004 files to BMP, JPG, TIFF, GIF, PNG, EMF and WMF images without the need of AutoCAD. It can also convert DWG/DXF files to vectory PDF file.And supports AutoCAD DWG/DXF File Version Conversion
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Active DWG DXF Converter 

A batch bi-directional DWG and DXF converter and File version converter without AutoCAD.
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