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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.
Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.
Autodesk Design Review - Design Review lets you view, mark up, print, and track changes to 2D and 3D files.
Wondershare PDFelement - All-in-one PDF editor
ZWCAD Viewer - Cross-Platform .DWG | .DXF | .DWT R12-2013 Viewer