Any recommendations? I dived into xmonad some time ago but I never found a good and fast windows manager for OS X.

I use bspwm, which has a very simple design and follows the unix philosophy quite nicely. A single daemon process which manages windows, and all configuration is done with the shell via the `bspc` command, which talks to the daemon over a socket. A separate daemon (sxhkd) is used for keybindings, and the configuration for sxhkd is just a map of keybindings (including mouse buttons) to shell commands, with a very simple DSL to allow groups of commands, and the use of the cursor position. Example from my configuration:

    alt + {Left,Down,Up,Right,h,j,k,l}
        bspc window --focus {left,down,up,right,left,down,up,right}

    {alt,super} + Tab	
        bspc {window,monitor} --focus next
    
    alt + super + {Left,Down,Up,Right}
        bspc window --swap {left,down,up,right}

    super + {Left,Down,Up,Right}
        bspc window --edge {left,down,up,right} push
    
    super + shift + {Left,Down,Up,Right}
        bspc window --edge {right,up,down,left} pull

    super + q
        bspc window --kill

Worth noting that bspwm treats monitors individually when using window commands, so you need a separate set to handle windows on diff monitors (unless using Xinerama).

I've no idea whether it works on OSX though. 2bwm seems to be popular among OSX users, but I've not tried it.

wow, the tiling concept looks even more flexible than the tiling in xmonad. I will definitely try this.

I wouldn't say it's more flexible, as XMonad has all the power of Haskell behind it (+ ability to create sub layouts), and is easier to create more complicated arrangements than hacking together a bunch of bash scripts - but I think it's a good balance of flexibility:simplicity. XMonad is pretty complicated to configure even pretty basic things.

There was some discussion about OS X window management options on another thread the other day: https://news.ycombinator.com/item?id=6998309

I like SizeUp a lot: http://www.irradiatedsoftware.com/sizeup/

I personally use Divvy on my Mac, I needed something simple and it works perfectly for me :)

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