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de·caff Viewer - The de·caff Viewer version 3.
A360 VIEWER - Free online CAD Viewer
DWG FastView - DWG FastView for Windows is a lightweight dwg/dxf drawing viewer and editor produced by Gstarsoft, no need of dwg format conversion, vector graph magnified without distortion and full compatible with AutoCAD DWG/DXF.
STP Viewer - Free STP Viewer - free software that lets you view 3D STEP files (.stp, .step file format).
ZWCAD Viewer - Cross-Platform .DWG | .DXF | .DWT R12-2013 Viewer
DWGSee - A lite and fast dwg viewer, let you view, print, markup, measure dwg files. Supports AutoCAD 2020 drawing format!