GridMove - GridMove - A window management tool that can quickly arrange your windows into desktop grids.
i3 - A dynamic tiling window manager designed for X11, inspired by wmii, and written in C.
WinDock - WinDock is a window manager ideal for large, or multi-monitor setups. Features:
awesome - A dynamic window manager for the X Window System developed in the C and Lua programming languages.
AquaSnap - Too many windows on your screen? Stop wasting your productivity.
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.