Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
Discord - Step up your game with a modern voice & text chat app. Crystal clear voice, multiple server and channel support, mobile apps, and more.
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