this board is running phpBB 3.1.2 and this chat is NOT an extension. it is in fact a modification
files modified to get this exact chat are as follows...
options this chat has...
@ - function to direct a chat to a specific user
font colour hold - users can select their own chat font colour
popup - chat opens in it's own popup window
chat rule display - you can display rules for chat
chat posts addon - when a member submits a new topic or posts a reply to a topic, a new post appears in chat saying just that