LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
SketchUp - 3D for Everyone
FreeCAD - An open-source parametric 3D modeler
Lightwave 3D - LightWave 3D combines a state-of-the-art renderer with powerful, intuitive modeling, and animation...
Sketcher 3D - Sketcher3D is a 3D modeling, design, and fun physics sandbox.
Autodesk AutoCAD - Autodesk AutoCAD is a commercial computer-aided design (CAD) and drafting software application.