Do you ever need to open AutoCAD files? If you’re renovating your home or office there’s a chance that an architect or contractor might send you an AutoCAD file in .dwg format. eDrawings Viewer is a free application that lets you open and view these files.  It’s been around for at least 15 years. The developer makes their money selling other applications which allow architects and others create .dwg files, so I expect eDrawings Viewer to remain free. Download it and give it a try.