Amethyst
Automatic tiling window manager for macOS à la xmonad
...Amethyst now is only supported on macOS 10.12+. Amethyst must be given permissions to use the accessibility APIs under the Privacy tab of the Security & Privacy preferences pane. Amethyst uses two modifier combinations. Amethyst allows you to cycle among several different window layouts. Layouts can also be enabled/disabled to control whether they appear in the cycle sequence at all. The default layout gives you one "main pane" on the left, and one other pane on the right. By default, one window is placed in the main pane (extending the full height of the screen), and all remaining windows are placed in the other pane. ...