signal-cli provides a commandline, dbus and JSON-RPC interface
Telegram messenger for Android
Used to integrate Android apps with Facebook Platform
Smoke: Android Crypto Chat Messenger
A beautiful SMS messenger for Android
Chatbot platform for various instant messenger
IXSF Messenger is a java-based messenger
BrowserBD is a Java based portable browser app for web browsing/IM
Instant Messenger Application
modifiable, predefined selection lists 4 clarity, efficacy, efficiency
Just another LAN messenger
GTK+ port of EZ Intranet Messenger
Agilo™ - The Agile Enforcement Office Suite
Chat Messenger written in Java
Cross-Platform Mobile Messaging Application
A Java RMI base messenger which works on LAN
Underground IM is a free Java Instant Messaging solution.