Window picker with hints for Awesome

Put hints.lua in the awesome config directory (~/.config/awesome)

Load hints module (in rc.lua):

require("hints")

Initialize (in rc.lua, must be after beautiful.init()):

hints.init()

Add a keybinding to run hints.focus() (in rc.lua in globalkeys declaration):

awful.key({ modkey }, "j", function () hints.focus() end),

Now, when you press modkey + j, letters will pop up on each window and you can select a window to focus by pressing the corresponding letter.