LibreCAD is a free and open-source 2D CAD application that lets you edit DWG files. Using it, you can edit DWG as well as DXF files in it. You can even design a new drawing from scratch using it.

How to Open DWG Files in Illustrator. The DWG format was originally designed by Mike Riddle in 1977 and licensed to AutoDesk Inc. in 1982 for creating two- and three-dimensional drawings.

"You can now view DWG files 100 percent just like AutoCAD can, for free," wrote AutoDesk's Shaan Hurley on his blog on Thursday in the United States. Written by Renai LeMay, Contributor Oct. 23 ...