You can try it here.
Additional information can be found on the website.
Nothing to do.
Simply go to index.html (on your local server).
If it's not already done, install nodejs. Then use grunt :
git clone git://github.com/stephomi/sculptgl.git
cd sculptgl
npm install -g grunt-cli # if not already done
npm install
grunt build # web version
grunt standalone # desktop webkit version
The raw environments can be found here (check the licenses !) :