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.
de·caff Viewer - The de·caff Viewer version 3.
DXF View - A lightning-fast drawing viewer enables you to view DXF and DWG™ files on Mac
ODA Viewer - ODA Viewer is a web-based software solution that allows you to view the files based on ODA format and you can easily zoom the file for detail visualization.
eDrawings Viewer - View, print, and review all types of eDrawings files Built-in Viewer
ZWCAD Viewer - Cross-Platform .DWG | .DXF | .DWT R12-2013 Viewer