This morning I saw on Twitter, Paul Irish, a link to something impressive. Tridiv is a 3D editor for creating models on CSS. For anyone who has ever fought with CSS transformations, to make even a simple 3D effect, it is known that such a thing can make life much easier. For the rest, another demonstration of what HTML5 / CSS3 is capable of.
The application interface resembles the usual 3D WYSIWYG editors. In Preview mode, you can customize the lighting / background / copy the source code / see how it all looks on CodePen. Saving in Local Storage is possible. Although, of course, an interesting question is why the transformations were chosen, and not WebGL. A drop of tar - so far only works in Chrome and Safari (but the code is prefix-independent, so it seems that support for other browsers will soon be added - in the same Firefox, there is a demo by the application author).