whaw is a program for X11 that can use advanced tiling algorithms and an intuitive user interface to quickly lay out windows without having to replace or modify the set up of your window manager of choice. whaw is meant to augment the capabilities of your current window manager, not supplant them.
Dzen is a general purpose messaging, notification and menuing program for X11. It was desigend to be scriptable in any language and integrate well with window managers like dwm, wmii and xmonad though it will work with any windowmanger.