Kwkim software, make 3D plans in the context?

Of course, I don't know how made this picture.
But most likely just "manually" in Illustrator or CorelDraw (or more exotic their equivalent).
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For example, steep dyadka draws in Illustrator two orders of magnitude more complicated things. Larger the link.
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And why not use 3D — like, for a single picture in one view is a much faster and more cost effective — at a certain skill, of course. On his site a few lessons there.

You here Google Scethup

It seems to me that the plan the link is made with 3d max and modified in a graphic editor.
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In General, there are a lot of programs, such as:
\rFree Home Design Software
\r3D Floor Plans
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More examples of software you can find pictures in Google: "3d plan"

This scheme is likely to drawn in a vector editor like Adobe Illustrator. In recent versions there are even specialized tools for drawing in perspective grid, but this grid can be identified manually.

The plan is a top view, not what is in the picture. And I also have a feeling that there was used a vector editor.

Thank you all for your answers, we will try to understand!

Perhaps SolidWorks.