Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...
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.
VoIP.ms - VoIP.ms is a VoIP origination and termination tool.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Mitel - Business Communications and Collaboration
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.