Skype for Slack - Move your slack discussions to a group skype call
Houseparty - Brining empathy to online communication.
Aircall Now - Make voice calls inside Intercom Messenger 📞💬
Skype - Stay in touch with your family and friends for free on Skype. Download Skype today to chat and call on desktop and mobile.
Slack - A messaging app for teams who see through the Earth!
Rume - Video chat that doesn't feel like work