Mumble - Mumble is an open source, low-latency, high quality voice chat software primarily intended for use...
YouTube - Our mission is to give everyone a voice and show them the world.
Discord - Step up your game with a modern voice & text chat app. Crystal clear voice, multiple server and channel support, mobile apps, and more.
Verystream - Upload and play your media files as fast as your connection lets you!
RaidCall - Free & Light. Setting up is fast and easy; with no need to rent or set up servers. Low CPU usage and minimum memory footprint allows for smooth, uninterrupted communication. im. Group Communication.
NewPipe - NewPipe is a lightweight YouTube front-end for Android.