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DWG (denoted by the .dwg filename extension) was the native file format for the Interact CAD package, developed by Mike Riddle in the late 1970s,[4] and subsequently licensed by Autodesk in 1982 as the basis for AutoCAD.[5][6][7] From 1982 to 2009, Autodesk created versions of AutoCAD which wrote no fewer than 18 major variants of the DWG file format,[8] none of which is publicly documented.

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In 2008 the Free Software Foundation asserted the need for an open replacement for the DWG format, as neither RealDWG[11] nor DWGdirect are licensed on terms that are compatible with free software license like the GNU GPL. Therefore, the FSF placed the goal 'Replacement for OpenDWG libraries' in 10th place on their High Priority Free Software Projects list.[18] Created in late 2009, GNU LibreDWG[19] is a free software library released under the terms of the GNU GPLv3 license. It can read DWG files from version R13 up to 2021, and write R2000 DWG files.

As neither RealDWG[11] nor DWGdirect are licensed on terms that are compatible with free software licenses like the GNU GPL, in 2008 the Free Software Foundation asserted the need for an open replacement for the DWG format. Therefore, the FSF placed the goal 'Replacement for OpenDWG libraries'[18] in 10th place on their High Priority Free Software Projects list.[49] Forked in late 2009 from libDWG, GNU LibreDWG[19] can read all DWG files from version R13 on. But the LibreDWG library, offered under the GNU GPLv3, could initially not be used by most targeted FOSS graphic software, such as FreeCAD, LibreCAD and Blender, because of a GPLv2/GPLv3 license incompatibility.[50][51][52] A GPLv2 licensed alternative is the libdxfrw project, which can read simple DWGs.[53] Some of these CAD licenses were only fixed recently to be able to use LibreDWG's GPLv3.

FreeCAD is a free and open-source application that can work with the DWG files by using the proprietary ODA File Converter for .dwg and .dxf files from the Open Design Alliance (ODA).[54] The ODA also provides a freeware stand-alone viewer for .dwg and .dgn files, ODA Drawings Explorer, which runs on Windows, Linux, and Mac OS X.

Autodesk DWG TrueView is a freeware, closed source, stand-alone DWG viewer with DWG TrueConvert software included, built on the same viewing engine as AutoCAD software. The freeware Autodesk Design Review software adds a possibility to open DWG files in Design Review to take advantage of measure and markup capabilities, sheet set organization, and status tracking.