Discord has been around since May, 2015, and was built as a platform for gamers to chat. It features, text, audio, and video chatting, and can be tweaked to attain very high sound quality with zero extra noise. Discord is also built such that it can be used entirely inside a web browser, meaning your interview guests don’t have to download the Discord app. In fact, there’s a way to set it up so that your interview guests don’t even have to sign up for a Discord account.
This looks like an interesting solution for those that hate Skype.