There is now a new project available at sourceforge net, named IrrExt. Although the status message on the project page indicates the contrary, the project is active and its SVN contains a collection of extensions to the Irrlicht Engine, like scene nodes, animators, GUI elements, materials, shaders, mesh loaders, physics wrappers and more. It is managed by bitplane and Zeuss, and extended constantly. The official forum announcement can be read here.