Show who is visiting a forum and thread

Hello guys,

I need a addon or template edit to do a thing that i had when my forum used Vbulletin, but i search a lot for it into resources and nothing...

In my vbulletin when you enter into a forum our a thread, in the botton was show how many guest was visiting the forum/thread and a list with name of the users that was visiting this forum/thread in this moment.

Anybody know any addon or configurarion, or template modification to do it for Xenforo?

Thanks and best,