As a Technical Manager for SolidCAD (www.solidcad.ca) I deal with CAD Managers from many different firms. It has come to my attention that most CAD managers are so engulfed in maintenance and troubleshooting of the CAD systems, they do not take the time to investigate what applications are out there that can help them coup.
There are 2 FREE applications from Autodesk that a CAD manager will find very handy and resourceful.
For those employs that want to view and plot only and not make any changes, Autodesk offers a free DWG viewer called DWG TrueView. The DWG TrueView also includes a converter to save mulitple DWG file to older formats/versions.
To reduce paper markups, this innovative tool from Autodesk allows a user to import a DWG or DWF(x), redline the drawing and then produce a DWF(x) file that can imported into any Autodesk software like AutoCAD and Revut. The Autodesk Design Review is the old Volo View or DWF Viewer.