3D equivalent to Visio

Question

Anyone recommend a tool. Commercial or freeware that allows things to be dropped into 3D Space then linked in various ways. This structure can be viewed rotated, flown through etc.

Ta

Answer 1

There is an addon for Visio, called 3D Visioner. Its commercial, and I have not used it myself, but there is a free trial so might be worth a shot.

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Answer 2

Google SketchUp has both free and pay-for versions.