*[https://github.com/JFreegman/toxic Toxic] - is a Tox-based P2P messenger that provides end-to-end encrypted communications without the use of centralized servers. It supports text messaging, file sharing, 1-on-1 voice and video calls, private audio conferences, public and private text group chats.
*[https://www.jabber.org/ Jabber] - is a original messaging service based on [https://xmpp.org/ XMPP] and has been continuously offered for free since 1999.
::XMPP clients& extensions
:::*[https://xmpp.org/software/ XMPP client list] - is a list of XMPP clients composed by XMPP itself.
:::*[https://otr.cypherpunks.ca/ Off-the-Record Messaging (OTR) for XMPP] - is a cryptographic protocol that provides encryption for instant messaging conversations. OTR uses a combination of AES symmetric-key algorithm with 128 bits key length, the Diffie–Hellman key exchange with 1536 bits group size, and the SHA-1 hash function.
:::*[https://omemo.im/ OMEMO.IM] is a free, secure XMPP-based chat client available for Android and Windows that utilizes the OMEMO (Multi-End Message and Object) end-to-end encryption protocol.
:::*[https://xmpp.org/extensions/xep-0384.html XEP-0384: OMEMO Encryption] defines an end-to-end encryption protocol for XMPP messaging that uses double-ratchet and key-exchange techniques to securely encrypt one-to-one and group chats across multiple devices.
*[https://getsession.org/ Session] - Session is an end-to-end encrypted messenger that minimises sensitive metadata, designed and built for people who want absolute privacy and freedom from any form of surveillance.
*[https://github.com/briar Briar] - is a messaging app designed for activists, journalists, and anyone else who needs a safe, easy and robust way to communicate. Unlike traditional messaging apps, Briar doesn't rely on a central server - messages are synchronized directly between the users' devices.