i3 - A dynamic tiling window manager designed for X11, inspired by wmii, and written in C.
Cairo-Dock - Cairo-Dock / GLX-Dock 3. 4 is now available. Cairo-Dock 3. 4 is finally released! One year after the 3.
dwm - dwm is a dynamic window manager for X. It manages windows in tiled, monocle and floating layouts. All of the layouts can be applied dynamically, optimising the environment for the application in use and the task performed.
RocketDock - RocketDock is a Mac OS X dock clone.
Openbox - Openbox is a highly configurable, next generation window manager with extensive standards support.
Dash to Dock - Gnome shell extension to position overview dashboard as a desktop launcher.