Mumble is great. I've personally used it with friends for about ten years now. The main client, while not as intuitive as Discord, is pretty easy to use and get

Mumble is great. I've personally used it with friends for about ten years now. The main client, while not as intuitive as Discord, is pretty easy to use and get used to. Many of my friends are non-technical and never had problems using Mumble aside from the occasional microphone issue (which happens to me regardless of VoIP software.)