People have been talking about Briar in another comment thread: https://briarproject.org/how-it-works/ https://briarproject.org/how-it-works/ Seems to be avai

People have been talking about Briar in another comment thread: https://briarproject.org/how-it-works/ https://briarproject.org/how-it-works/ Seems to be available on F-Droid, but unfortunately is not cross-platform.