A peer to peer, private, anonymous and secure messenger that works over tor. It's also free and open source software which gives users the freedom of changing it and redistributing it under the terms of the GNU General Public License v3.

Features:
No ads, No servers, And No Trackers.
Completely free software and open source and everything is over Tor.
Double triple Diffie-Hellman end to end encryption
Completely peer to peer using hidden services
Includes Tor and obfs4proxy so you don't need any other app to connect
Ability to use Tor bridges (meek_lite,obfs2,obfs3,obfs4,scramblesuite)
Cryptographic Identity Verification
Excellent Network Security
Encrypted file storage on Android
Disappearing messages by default
Screen security

Both peers have to add each others onion addresses to be able to communicate

Live Voice Calls over tor (alpha feature)
Profile Pictures
Text Messages
Voice Messages
Metadata stripped media messages
Raw file sending of any size (100 GB+)
Encrypted notepad
More features coming soon

How to use: https://anonymousmessenger.ly/how-to-use.html
Translate: https://www.transifex.com/liberty-for-all/anonymous-messenger/
Issues: https://git.anonymousmessenger.ly/dx/AnonymousMessenger/issues
Source code: https://git.anonymousmessenger.ly/dx/AnonymousMessenger
License: GPL-3.0-or-later

As of December 2020 It's still an ongoing effort and although fully functional it's only available for Android so far.