Slack - A messaging app for teams who see through the Earth!
All Hands - Async video updates for your team
Mattermost - Mattermost is an open source alternative to Slack.
Threads - Making work more inclusive.
Quip Chat Rooms - Real-time chat with your team
Brosix - Brosix will improve the efficiency and decrease the expenses of your business by providing you all-in-one features package and many control functions.