Twilio - Brings voice and messaging to your web and mobile applications.
Skype - Stay in touch with your family and friends for free on Skype. Download Skype today to chat and call on desktop and mobile.
Plivo - Plivo simplifies your customer engagement.
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.
SightCall - SightCall offers comprehensive real-time video APIs and Mobile SDKs that makes it simple to embed...
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.