Works on Mac and PC

SketchUp PRO

Award winning 3D modelling that anyone can use. Radically easy and intuitive interface allows novices to get started easily and seasoned veterans to work quickly. The sketchy looking result is perfect for conveying initial concept design without having to model every last detail

Main features include the following:

 

View Training for SketchUp

You can find Google SketchUp downloads for components here and plug-ins here.