I've no experience with any 3rd party chat extensions, sorry. Moving topic to general discussion as you are likely to get better feedback regarding other extensions there. CB has no integrations with any chat extensions as well.
Kyle (Krileon) Community Builder Team Member Before posting on forums:
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With CometChat, you get a whole lot of features at a very reasonable cost which includes audio video chat, one-on-one chat and moreover they do the integration for free. They also offer money back guarantee within 30 days from date of purchase.