"Floorplanner is the easiest and best looking way to create and share interactive floor plans online. With simple drag and drop tools you can make accurate plans within minutes all on scale. Floorplanner BASIC is free for personal use. Our PLUS account offers more space if you need it."
I have yet to try this out...but gathering from reviews from various forums, this seems to be another promising free 3d visualization tool. :)
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