With uBrowser you can stick your web browser on a virtual 3D surface and spin it around in real time. In truth it's basically a tech demo that showcases Mozilla's Gecko web page rendering engine married to OpenGL. It's not really good for anything, but it is fun to stick your favorite web site on a sphere or a waving flag and turn it this way and that. Since it's based on LibXUL, it's a fully functional web browser, which means you can click on links, check your Gmail, and even play flash games. And it's also open source.