SketchUp

SketchUp is a simple and intuitive, but powerful tool, free for anyone to use. Using SketchUp, you can model anything you can imagine – new piece of furniture, your home or your city for Google Eath. You can easily get models online for free on the Trimble 3D Warehouse.
If you want export your 3D model in 2D and 3D formats for use with other applications or use LayOut for presentation, you can use SketchUp Pro.