Skype for Slack - Move your slack discussions to a group skype call
Slack - A messaging app for teams who see through the Earth!
Aircall Now - Make voice calls inside Intercom Messenger 📞💬
Slack for Mac - A new, improved Slack desktop app for Mac
HandsFree 2 - Call and SMS in Mac using your Android phone via Bluetooth
Workplace by Facebook - Connect everyone in your company and turn ideas into action.