Discord - Step up your game with a modern voice & text chat app. Crystal clear voice, multiple server and channel support, mobile apps, and more.

Twilio - Brings voice and messaging to your web and mobile applications.

Mumble - Mumble is an open source, low-latency, high quality voice chat software primarily intended for use...

Plivo - Plivo simplifies your customer engagement.

Twitch - Twitch is one of the most prominent streaming services around, serving as a platform primarily for video game and pop culture streamers.

Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates