Slack - A messaging app for teams who see through the Earth!
Missive - Team communication app now supporting FB, Twitter & SMS
9mCollab - Collaborate (efficiently) Conclude (fast) Contribute (in the knowledge base)
Front - multi-channel inbox service for collaborative teams
Mattermost - Mattermost is an open source alternative to Slack.
Facebook 360 Photos - Share an immersive view of your world