It’s not my project but Rocket.Chat has a lot of support, active team and is the best Chat App in Meteor at the moment. The team seems dedicated at making the admin options to allow it to be very dynamic (single vs multiroom, guests vs invite only, branded app, etc.). I just wanted to announce anyone who can to join in and help the team develop… They discuss inside their app as it’s already functioning (I’m using their Android and Mac OS app now)
https://demo.rocket.chat/channel/general
We need more devs to actually put in code time, especially to help match Slack features.