SketchUp is a 3D modeling program designed for architects, civil engineers, filmmakers, game developers, and related professions. It also includes features to facilitate the placement of models in Google Earth. It was designed to be more intuitive, flexible, and easier to use than other 3D CAD programs.
I tried it and in a few minutes I was able to create some pretty complex models.
There are some great video tutorials to learn how to use Sketchup.
There is a pro version that cost hundreds of dollars but you can download the free version here.
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