##[Amethyst][1] (open source, free)

Tiling window manager for OS X similar to xmonad. Was originally written as an alternative to fjolnir’s awesome xnomad but written in pure Objective-C. It’s expanded to include some more features like Spaces support not reliant on fragile private APIs.

Source code: http://github.com/ianyh/Amethyst/

![enter image description here][2]


  [1]: http://ianyh.github.io/Amethyst/
  [2]: https://i.sstatic.net/lA0SS.png