Google SketchUp (free) is an easy-to-learn 3D modeling program whose few simple tools enable you to create 3D models of houses, sheds, decks, home additions, woodworking projects – even space ships.
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(08/25/2006)
http://sketchup.google.com/
With the free Lego Digital Designer 1.6, you can design your own virtual Lego model in 3D. Optionally, you can order the exact set of bricks over the Internet and build it in real life as well!
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(08/23/2006)
http://ldd.lego.com/
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