Is this a hosted chat or can one download and install it on their own server?  Hosted chats have their place, such in shared hosting, but it is also nice to not have yet another third party vendor handling things; UNA already has way too many third party vendor code; in my opinion of course.

That's those link that ive been able to find so far

https://codologic.com/page/freichat-free-php-chat-script-software