i3 - A dynamic tiling window manager designed for X11, inspired by wmii, and written in C.
Moom - Move your mouse over the green zoom button in any window, and Moom's mouse control overlay will appear (as seen in the above animation).
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.
Hammerspoon - This is a tool for powerful automation of OS X.
Fluxbox - Fluxbox is a window manager for X that was based on the Blackbox 0.61.1 code.
Spectacle App - Move and resize windows with ease.