Voxer - Turn your phone into a Walkie Talkie. Don't waste time on phone calls and voicemails.

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

NextPlane - NextPlane offers cloud-based, scalable unified communications federation service for the enterprise.

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

Sameroom - Chat interoperability-as-a-service

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