progeCAD - progeCAD is DWG/DXF-native CAD software, built for professional drafting.
SolidWorks - Dassault Systèmes SolidWorks Corp. develops and markets 3D CAD design software, analysis software, and product data management software. SolidWorks is the leading supplier of 3D CAD product design engineering software.
BricsCAD - A powerful CAD platform, with features familiar to you from native .dwg applications.
FreeCAD - An open-source parametric 3D modeler
MicroSurvey Software - MicroSurvey CAD is a full-featured CAD package that lets you do everything from creating point clouds to designing complex survey networks.
SketchUp - 3D for Everyone