Twilio - Brings voice and messaging to your web and mobile applications.
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.
Plivo - Plivo simplifies your customer engagement.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
SendBird - SendBird is messaging-as-a-service.
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.