Briar - Secure messaging, anywhere
Gajim - Full featured and easy to use Jabber client
Bridgefy - Integrating Bridgefy allows mobile devices to communicate in a secure and efficient way across...
CoyIM - CoyIM is a safe and secure chat client.
WorldChat - Meet new people around the World on WorldChat.tv, the Original World Chat since 2011.
Empathy - Apps/Empathy - GNOME Wiki!