Metisse

Metisse is a 2.5D desktop environment. More specifically, it is a X window manager with many features that set it apart from the traditional 3D "cube" workspace. Windows can be turned 3 dimensionally in any direction, enabling the user to fit more windows onto a screen, and they can be scaled, all while remaining fully operational. The development team has avoided such effects as wobbly windows, giving functionality and productivity higher priority than eye candy.