3dtin : modeling and sharing inside (modern) browsers

At http://www.3dtin.com you can use your gmail-account to login and freely create 3D models, using a small set of modeling tools (cubes, some primitives and basic color). It resembles a basic paint program, but with all pixels being 3D boxes.

There is even a "smooth" option to make a subdivision surface.

The application runs directly inside the browser, so ensure you have a very recent one, such as an up-to-date version of Chrome, as it needs WebGL support and JavaScript to let the magic work.

Nothing to install, nothing to launch, just open the site and start creating.

However, beware that everything you create on this site is automatically licensed under a Creative Commons license, allowing anyone to make adjustments, without royalty fees, but with reference to you as the original author.