Slack - A messaging app for teams who see through the Earth!
Tealfeed - A knowledge sharing platform to empower creators
Mattermost - Mattermost is an open source alternative to Slack.
Quip Chat Rooms - Real-time chat with your team
Lunyr - A decentralized crowdsourced encyclopedia.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.