AutoCAD LT - AutoCAD LT is a drafting tool to create 2D drawings.
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.
BricsCAD - A powerful CAD platform, with features familiar to you from native .dwg applications.
Autodesk Design Review - Design Review lets you view, mark up, print, and track changes to 2D and 3D files.
ActCAD - ActCAD is one Software for many applications covering the primary domains of – Architecture, Engineering, Construction (AEC) including Structural, Electrical, and Mechanical.
ZWCAD Viewer - Cross-Platform .DWG | .DXF | .DWT R12-2013 Viewer