You can open DWG files without AutoCAD using alternative software such as Autodesk DWG TrueView, DWGSee, DraftSight, and others. These programs enable you to view and edit DWG files without AutoCAD. Moreover, certain online converters can change DWG files to formats accessible with common software or even offer online viewing. DWGSee provides both a desktop version and a free online application, making it a popular choice as a DWG viewer.