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Downloadatoz.com offers complete common file extensions list with detailed information about each file extensions and the programs that open the file format.

Autodesk User Group International (AUGI) discussion forums.

CADTutor provides free video tutorials, articles, downloads and a busy community forum for users of AutoCAD and associated software.

ARS (Action Request System) forum and mailing list archive. Action Request System discussions

Dotwhat.net is a file extension resource website containing detailed information on a huge number of file extensions, such as the software used to create and open files.

PDF to DWG Converter can convert PDF to DWG or DXF easily and fast. With Stand-alone version and AutoCAD Addin Version, this PDF to DWG converter applies to both AutoCAD users and non-AutoCAD users.

ArcGIS forums

DevCentral is your source for tools, techniques, and collaboration to help you build solutions with iControl and iRules that enable applications to work in concert with the underlying network.

DWG to PDF,Raster to Vector converter,DWG converter,DXF converter,Free DWG viewer,DWG to SVG,DWG to EPS,DWG to WMF,DXF to PDF,DWG to JPEG,DWG to TIFF,DWG to PLT,TTF to DXF,CAD to PDF.

MathWorks is the world’s leading developer of technical computing software for engineers and scientists in industry, government, and education

Welcome to Numerical Innovations - "Professional CAD/CAM Solutions"

The Number One Site for CAD-Duct Solids Users and Building Services Co-ordination Engineers..