Not a module, you have to create a directory and database to install livezilla on your host just like a self install of TB, install the client on your mac, then connect the two.
The presto changeo module makes it a simple copy/paste to connect it all into TB once your web tracking/live chat info is generated within livezilla.
Might be able to paste the livezilla code into your custom code sections in Jonny's theme without it but the presto module makes it really simple, plus it's free ;)
I was thrilled to find they finally made a mac version after using it so many years ago on windows, just updated the latest version required by writing over all my existing files it recognized as an update then installed the mac dmg. Didn't loose all my previous data! It shows as a trial but after 30 days you get the basic free version which is all I've ever used.
You can leave livezilla client open in a separate desktop window it dings when you have traffic :)
I found talk.to timed out pretty quickly, just didn't like all the data on their server, this is on your own host.