Free DWG Viewer 

Free DWG Viewer will open native DWG, DXF, and DWF files for viewing, along with accompanying Xref files. It will also open Informative Graphics' own "content sealed" (CSF) file format, which is generated by the company's Net-It publishing products
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DWG DXF Convert 

DWG DXF Convert is an AutoCAD DWG/DXF bi-directional translator. It converts an AutoCAD DWG file into an AutoCAD DXF file and vice-versa without the need of AutoCAD. DWG DXF Convert also supports batch conversions of multiple DWG or DXF files.
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