Fun, unique, powerful. Great application!
According to this Autodesk Labs article, Project Shapeshifter has moved up from technology preview to the Autodesk 123D Sandbox:
http://labs.blogs.com/its_alive_in_the_lab/2015/05/project-shapeshifter-graduates-from-autodesk-labs-to-the-123d-sandbox.html
http://www.123dapp.com/sandbox
Shape Shifter 2015-07-02
An easy way to create complex 3D Printable models in your web browser.