Software for designing 3D models abound on the market.

Some of them are easy to learn and use  and others more complex, with prices spanning from free to higher budget.

A non-exhaustive list can be found here: http://en.wikipedia.org/wiki/List_of_3D_computer_graphics_software
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3D scanning allows you to scan objects from multiple angles to capture the apparent and hidden parts of your object.

The collected data can be combined to create the best possible 3D model. If you are looking for 3D scanners, look into these:

Artec http://www.artec3d.com/

Structure http://structure.io/

More information can be found here :
​http://en.wikipedia.org/wiki/3D_scanner

Ready to upload a 3D model ? Here is the guide on how to do so.