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

Skype for Slack - Move your slack discussions to a group skype call

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

Calls on Slack - Make voice calls in Slack

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

Pingly - Your communication hub — Email, text & voice in one app