3D
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Blender

Sketchup

MeshLab

SCULPTRIS
http://pixologic.com/sculptris/

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Software for students
Autodesk supports the student community by providing the tools you need to create your next 3D project and get prepared for academic and career success.

http://www.autodesk.com/education/student-software

http://www.autodesk.com/education/getting-started

http://digitalsteam.autodesk.com/