Name hackers, well, that's mostly server side (or it use to be, only the shout and whisper functions worked with name hack). The easiest way to find a name hacker is to send him a whisper and wait for a reply. There was also a trick with the friend chat, where it seemed like a GM entered your PM, tho that was easy to spot because the "GM" reply is along side the reply of the person you're talking to.