BricsCAD - A powerful CAD platform, with features familiar to you from native .dwg applications.
progeCAD - progeCAD is DWG/DXF-native CAD software, built for professional drafting.
iCADMac - User friendly 2D/3D CAD software for MAC OS X, which reads and writes DWG format drawing files.
MicroSurvey Software - MicroSurvey CAD is a full-featured CAD package that lets you do everything from creating point clouds to designing complex survey networks.
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.
CAESES - CAD solution for automated shape optimization