ATM, ReactPHP has IRC as the official communication channel.

From my point of view, if we want to increase this community, which in fact should be insane, we should try to transform this community in order to be more easy for the people to ask, respond and solve problems. Otherwise, frustration is what people have, and this is usually synonym to "bounce rate".

I can understand that some people don't like Slack because is not open source, but as far as I see, Slack communities are, at this precise moment, the most growing communities. That could help a lot ReactPHP to start growing as it deserves.

This is my proposal.
Let the discussion start :D