Dialpad - Switch is a cloud-based phone system built for Google Apps users.
Slack - A messaging app for teams who see through the Earth!
Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Zoom - Equip your team with tools designed to collaborate, connect, and engage with teammates and customers, no matter where you’re located, all in one platform.
Mattermost - Mattermost is an open source alternative to Slack.