Autodesk® Design Review
View, print, mark up, and compare versions of 2D and 3D drawings, maps, and models with Autodesk® Design Review software. Design Review works with a wide variety of file formats, including DWF and DWFx, DWG and DXF (requires installation of free* DWG TrueView software), and Adobe PDF, plus several image file types.
DWG TrueView software enables you to view DWG and DXF files, just as you would in AutoCAD. You can also use this free DWG viewer to plot, convert, and publish DWG files.
Autodesk Inventor® View
Share native Autodesk® Inventor® software data with non-Autodesk Inventor users with this freely distributable viewer that delivers high-fidelity viewing and printing of parts, assemblies and drawings.
Autodesk® Navisworks® Freedom
Viewer for easy opening of .NWD and 3D DWF files.
For more information and downloads: