Zulip Desktop client for Mac, Windows and Linux
Distributed instant messaging system for developers
Home to the Signal Protocol and other cryptographic primitives
Secure communication software
Software per Call Center
Smoke: Android Crypto Chat Messenger
IXSF Messenger is a java-based messenger
GTK+ port of EZ Intranet Messenger
Chat Messenger written in Java
a java based LAN messenger
Underground IM is a free Java Instant Messaging solution.
Small messenger solution for teams inside a LAN using eclipse
small, fast, java messenger