On occasion, there has been the odd person who has posted hereon with a request for an easy application with a low learning curve that might help them with some elements of home-design. While I haven't used this, and so am unsure exactly what it does, and while it doesn't replace a good architect or designer, I thought that it might be worth posting:
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There's even some kind of live online trial version too!
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(Sweet Home Alabama in stereo);D