RapidWeaver Stacks add-on info:
The ChatCenter stack allows you to add a chat function to your website. The stack uses the free ChatCenter.me service. Sign up for a free account over at ChatCenter.me – great service. A website is meant to establish a communication with your visitors… so why not really ‘talk’ to them?
Note that ChatCenter now has a widget you can use instead of this stack. Learn more over at the chatcenter website.
RapidWeaver, stacks, responsive, free stack.