Honest question: who here is using open source XMPP software today in a Slack-like manner? If so, what is your software+config, and how do you like it? When I

Honest question: who here is using open source XMPP software today in a Slack-like manner? If so, what is your software+config, and how do you like it? When I last investigated XMPP for this, back in January 2014, I found that open source support by both servers and clients, for Slack-like features such as search and persistent chat history, were at least rough around the edges, if not lacking entirely.