Sure, I was thinking of the JIRA+GHE setup as well though. As for IRC – they also use some weird clients (actually, might be the same one everwhere, just rebran

Sure, I was thinking of the JIRA+GHE setup as well though. As for IRC – they also use some weird clients (actually, might be the same one everwhere, just rebranded) to hide away the fact that it's IRC. Some people I know would just use Irssi or whatever. I'm guessing the fact that IRC is used is that it's reliable, simple to set up, and works for a rather large audience even without any redundancy. Most extra functionality that the Slack etc. provide – integrations, notifications embedding things – are not really necessary (but possibly wanted) in that context. E-mail still reigns supreme for anything that can't fit in simple text, and certainly for more formal comms and sign-offs.