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.
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
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.