Converse is a free and open-source XMPP chat client in your browser.
WikiSuite and Converse are working closely together. Notably to convert upcoming v4 to Bootstrap
Converse offers both pop up chat and full page chat.
Converse is the built-in (but optional) XMPP client in Tiki Wiki CMS Groupware: https://doc.tiki.org/XMPP