Dialpad - Switch is a cloud-based phone system built for Google Apps users.
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.
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.
3CX - Hosted PBX with CRM integration and mobile apps
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.