There is now an official Discord server for the /r/CysticFibrosis subreddit and for anyone else who'd like to join: https://discord.gg/7fxBxNA

Discord can be accessed through your browser, as an installed program, or through an app on your phone. It's super versatile, free to use, and (in my opinion) way better than Skype or TeamSpeak, Mumble, and all those other alternatives that are clunky to use.