I do like IRCCloud, and use it often. But it's not Slack. Slack is one of those things that seems sortof dumb and simple but it just isn't. They've built a very

I do like IRCCloud, and use it often. But it's not Slack. Slack is one of those things that seems sortof dumb and simple but it just isn't. They've built a very compelling set of features that many of us now just take for granted. Mattermost is the closest 'freemium' alternative to Slack I've seen.