Rocket.Chat is the ultimate Free Open Source Solution for team communications. It is packed with killer features: from group messages and video calls, screen and file sharing, all the way to helpdesk live-chat.
It provides webapp interface, cross-platform desktop client, iOS and Android mobile apps.
It is becoming very popular:
Winner of the BlackDuck - 2015 Open Source Rookies of the Year
Featured in one of your tutorials
Already available at many one-click deploy competitors:
And our Docker Image have been downloaded hundreds of thousands of times:
Founder & CEO