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.
ArCADia-Architecture - ArCADia-Architecture is a revolutionary component for the instant creation of architectural documentation and object drawing.
Autodesk Design Review - Design Review lets you view, mark up, print, and track changes to 2D and 3D files.
Vectorworks - Vectorworks 2D / 3D CAD and BIM software for Mac or Windows provides one flexible solution for your entire design process. Sketch, model, and present with the ultimate software from start to finish.
ZWCAD Viewer - Cross-Platform .DWG | .DXF | .DWT R12-2013 Viewer