You can message and share files inside your intranet without a server.
Berty is a secure peer-to-peer messaging app
A universal instant messaging (IM) program
Development toolkit for Web Services and XML data bindings for C & C++
Smoke: Android Crypto Chat Messenger
Extract lost email passwords
Cerberus Content Management System
IXSF Messenger is a java-based messenger
Open-source social network CMS and mobile apps.
Create chat bots for Facebook Messenger, Slack, Amazon Alexa, etc.
This Program Contains Many Useful Network Tools
MSN compatible messenger application
Instant Messenger Application
Open-source server of Planet Ring for Sega Dreamcast
A small, reliable, local network messenger that doesn't need internet
A small (ish) messaging server for anything you can think of
Live chat software to provide online customer support service
simple yahoo messenger client
An intranet chat application that does not require a server.
A messaging system designed for home use Created by: Chad Dunn
A GNOME icon set, which contains tray icons for "Pidgin"
Chat Messenger written in Java