Introduction: How to 3d Sculpt Something Right in Your Browser
How to a 3D Sculpt in your Browser(no expensive or complicated software to be downloaded)
.. and then optimise and texture the model using free/opensource software.
am sure a version will come out soon that can handle the texturing online.
for now you can also use meshlab to export the 3d .obj file to a 3d printable format like .stl
Sculptfab - https://labs.sketchfab.com/sculptfab/
Meshlab - http://meshlab.sourceforge.net/
Blender - http://www.blender.org/