I stumbled across this screenshot of a person running XFCE:
I noticed that the persons top-panel bar was OSX-like. What I mean is that the top-left has the focused application's name, while the top-right of the panel has the standard top-panel widgets and icons (time, Wi-FI etc) before the maximize/minimize and close buttons.
I'm trying to figure out how this was achieved? I recently migrated from OSX and would like the same kind of setup.
Source: taken from here, confirming that he's running XFCE not some other.