DarkWire
Direct, encrypted messages and calls
DarkWire sends messages and calls straight between two devices, with no server in between. Encrypted end to end with the Signal protocol, and no account: no phone number, no email address. For Android, Linux, Windows and in the browser.
Who it's for
For anyone who wants to talk privately without a company knowing with whom.
Works with
Used on its own; it's separate from ClearFlow and the other apps.
Price and status
Available and free, open source (AGPLv3).