Aircall Now - Make voice calls inside Intercom Messenger 📞💬
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.
Calls on Slack - Make voice calls in Slack
Whereby (formerly appear.in) - Collaborate from anywhere - video meetings with no downloads
Mornin - An anonymous audio conferencing service
HandsFree 2 - Call and SMS in Mac using your Android phone via Bluetooth