"Accelerate your design reviews on your desktop with Autodesk® Design Review software. It’s the free*, all-digital way to view, mark up, print, and track changes to Autodesk 2D and 3D files—without the original design software. Work with a wide variety of file formats, including DWF™ and DWFx, DWG™ and DXF™ (requires installation of free DWG TrueView™ software) and Adobe PDF, as well as several image file types including .bmp, .jpg, .gif, .pcx, .pct, .png, .rlc, .tga, .tif, .mil, .cal, and more." - AutodeskWe can export sheets to a DWF or DWFx format, which will then become readable in Design Review. This can be accomplished through the Application Menu.
In Design Review, a number of markups can be made, as indicated by the images below
Once markups have been completed in Design Review, the DXF file can be linked back into Revit.
Autodesk Design Review 2013 can be downloaded by following this link.
Note: Even though the latest version of Autodesk Design Review is 2013, it is still widely used as the preferred markup tool