Sketchup is one of the best-known products for creating drawings and designs in 3D. It was once a Google product but was sold off a few years ago.
You can download the software for use on your desktop PC. However, the company behind the product, Trimble, is now offering a browser-based version that you can use for free. So if you've never tried designing something in 3D, it's now really easy to try it out.
Just head to http://www.sketchup.com/products/my-sketchup to get started. All you need is a modern web browser and a reasonable monitor.
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