Tokpod!

Twilio is a web-service API that lets you use your existing web languages and skills to build voice and SMS applications. We focus on building a simple, powerful, pay-as-you-go communications platform so that you can focus on what you do best.

Plivo is a voice and SMS API platform that enables developers and enterprises to build powerful apps with great features. With 24/7 free tech support and low prices, Plivo can help your business scale globally.

Sinch is a powerful voice and messaging SDK that lets you bring your apps to life with VoIP and WebRTC technology. Simplicity is at its core and you can get your first app up and running in a few lines of code and a matter of minutes.

Agora.io provides the building blocks developers need to add high definition voice and video communication to any mobile or PC app through a simple, powerful SDK. Agora.io proprietary technology handles billions of real time communication minutes every year, which allows developers to support as many as 2,000 users in a single call. At Agora, we handle the challenging pieces of providing quality end to end user experience (QoE) globally for real time communication, so our customers can focus on expanding their business. Don’t worry anymore about poor or unpredictable video/audio communications, complicated setup or sky high prices from other services. »