Download .NET & Java libraries to build applications that can process & convert CAD drawings including the ones created with AutoCAD....AutoCAD DWG and DXF and DGN, DWF, DWFX, IFC, IGS, IGES, STL, DWT, FBX...drawings like DWG, DXF, DGN, DWF, DWFx, Collada(DAE), IFC, IGS, IGES...