Microsoft 3D Builder - View, capture, personalize, and print 3D models.
Autodesk DWG TrueView - Get a free DWG viewer to view, open, edit, and convert .dwg files, the native file format for AutoCAD files. DWG Trueview includes DWG TrueConvert.
Infurnia Architecture Design - Infurnia is a powerful, multi-featured cloud-native Architecture solution that you can use to introduce BIM in your Designs, partner up with others using functions, and take care of the data in an effective way.
LiteCAD - Create, edit, view, and print 2D CAD drawings using the file formats: dxf, dwg, shp ;Download-Size...
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
ZWCAD Viewer - Cross-Platform .DWG | .DXF | .DWT R12-2013 Viewer