Athene is a desktop system for Linux that uses its own graphics drivers for high speed access to your graphics card. Because the Athene desktop and its applications have direct access to the graphics hardware, they have a significant speed advantage over conventional X applications. Athene is also backwards compatible with your existing X11 software. It features a highly responsive interface, scalable icons, translucency, alpha blending, Unicode support, and Windows compatibility.
larswm is a modified version of the 9wm window manager that adds virtual desktops, automatic window tiling, and many other features designed to make it a highly efficient user environment. One of the design goals is that you should never have to manually shuffle windows around on the screen. Another is that it should use as little CPU time, RAM, and screen space for itself as possible.
yeahwm (yet another h* window manager) is a minimalist window manager based on evilwm. It supports Xinerama and respects aspect size hints (useful with Mplayer and tvtime). It features creative usage of the mouse, tabbed titles that can be repositioned (BeOS-like), and good keyboard control.