mightysignal - The engineer's approach to lead generation.
Slack - A messaging app for teams who see through the Earth!
Arbiter - Slack app you can use to compete with your colleagues!
Mattermost - Mattermost is an open source alternative to Slack.
Social Games in Slack - Polly brings your WFH team together with interactive games
Quip Chat Rooms - Real-time chat with your team