Custom EntityDisplay / GUI above players head

I’ve been searching for over an hour now for a new GUI above the players head, the thing that display their username and HP, the default one is very simple and boring.

I’ve seen many servers with custom ones but I don’t know the real name for it so I’m finding it hard to search for them, could anyone point me in the right direction?

This is what I’m talking about: http://prntscr.com/7uya0g

Thanks in advance.

Player:GetEyeTrace

Entity:EyePos

Vector:ToScreen

Thanks for the reply meharryp, It seems I posted this in the wrong section.
I have very little experience with LUA and was just looking for an already made gui for it.