Twilio offers developers a powerful API for phone services to make and receive phone calls, and send and re...

Plivo provides basic building block APIs in the form of Plivo XML and HTTP API, to create telephony apps, s...

Stream allows you to build scalable feeds, activity streams, and chat. Stream’s simple, yet powerful API’s ...

SendBird is a Messaging SDK, Chat API, and fully managed chat infrastructure for your mobile apps and websi...

The Twilio API for WhatsApp provides developers all over the world with a simple, reliable, and officially ...

Chat API and SDK. With a beautiful UI Kit, easy to use React Components and powerful API. Add Chat to any a...

Open source video conferencing apps for iOS, Android and web. Deploy your own video collaboration app in fi...

Sendbird Chat iOS Framework.