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.
AutoCAD LT - AutoCAD LT is a drafting tool to create 2D drawings.
ZWCAD Viewer - Cross-Platform .DWG | .DXF | .DWT R12-2013 Viewer
CAD Builder - CAD Builder is a computer-aided designed software that makes it easy for you to create professional designs when it comes to designing parametric modeling.
iCADMac - User friendly 2D/3D CAD software for MAC OS X, which reads and writes DWG format drawing files.
Autodesk Design Review - Design Review lets you view, mark up, print, and track changes to 2D and 3D files.