SketchUp - 3D for Everyone
BricsCAD - A powerful CAD platform, with features familiar to you from native .dwg applications.
Autodesk AutoCAD - Autodesk AutoCAD is a commercial computer-aided design (CAD) and drafting software application.
iCADMac - User friendly 2D/3D CAD software for MAC OS X, which reads and writes DWG format drawing files.
Assetforge - Asset Forge allows anyone to create 3D models and 2D sprites using building blocks.
AutoCAD LT - AutoCAD LT is a drafting tool to create 2D drawings.