A Great free AutoCAD Drawing Viewer
GstarCAD (64-Bit)
More stable and faster, GstarCAD 2016 is an optimized CAD platform to save countless hours of design and rework
AutoCAD
AutoCAD: The most popular tool you can use
Autodesk DWG Trueview
Free software for viewing AutoCAD files
Microsoft PowerPoint 2016
Important note: Microsoft PowerPoint 2016 is no longer available