Still thinks its miles better than slack/skype for inter-office communication(Notice i said communication not app/task-tracking/1001-Things our over-engineered 'chat-programs' provide today).
XChat - Good times :)
PS. Would love to see some benchmarking for a modern-irc-daemon written in say Go or something else with good concurrency primatives. Was quite a issue 'back in the day' the max clients per server.