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Re:Kwm, tiling window manager for OS X by bojo on Tuesday December 22, 2015 @06:53AM (#10777193)
If you look closely it appears to be a fullscreen iTerm2 running a fancy tmux powerline.

Edit: From https://github.com/koekeishiya/kwm/issues/8#issuecomment-166...

"The Apple menubar is hidden using the option that was added with El Capitan. I'm using the program nerdTool to create the illusion of a bar that you see in the screenshot."

Re:Kwm, tiling window manager for OS X by PeCaN on Tuesday December 22, 2015 @12:36PM (#10779047)
I think that 'iTerm2' in the corner is just the name of the currently focused window.