We currently use LiveZilla on our site. I will say its a great piece of software that's free and better then most paid Chat systems. However, LiveZilla is not the best out there of course and does lack many things and has its flaws like all free and paid software.
So if you can deal with the lil things like only PC and other things its a great piece of software and I recommend it to anyone.
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@greatscott, no, not really. You can use LiveZilla even if you didn't give admin permissions to your WHMCS, since they work independently. Although, you have to give the admin account on LiveZilla because you can't create another admin account.