ToolDescriptionWebsite
SculptrisA 3D modeling software that was recommended by a colleague.  Free download should do the trick for most school requirements.  Paid version for all the professional tools.http://pixologic.com/sculptris/
MAYAI like this free 3D modeling software platform.  A lot of tools and a bit more complicated to use.  Paid version with more professiional tools.  Suitable for our needs at senior high level.http://www.autodesk.com/education/free-software/maya
CURA3D Printing software used by a variety of 3D Printers.  We use it with our Printrbot.https://ultimaker.com/en/products/cura-software