Aircall Now - Make voice calls inside Intercom Messenger 📞💬
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.
Calls on Slack - Make voice calls in Slack
Tauria - True end-2-end encrypted group calls for up to 50 people
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.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.