i3 - A dynamic tiling window manager designed for X11, inspired by wmii, and written in C.
GridMove - GridMove - A window management tool that can quickly arrange your windows into desktop grids.
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.
WinDock - WinDock is a window manager ideal for large, or multi-monitor setups. Features:
Openbox - Openbox is a highly configurable, next generation window manager with extensive standards support.
AquaSnap - Too many windows on your screen? Stop wasting your productivity.