You can message and share files inside your intranet without a server.
A New Kind of Instant Messaging
Berty is a secure peer-to-peer messaging app
A glossy Matrix collaboration client for Android
A universal instant messaging (IM) program
Development toolkit for Web Services and XML data bindings for C & C++
Chat Messenger. E-Mail-Client. Websearch. Filetransfer.
Smoke: Android Crypto Chat Messenger
IXSF Messenger is a java-based messenger
Distributed instant messaging system for developers
Open-source social network CMS and mobile apps.
Internal communication software for business
Create chat bots for Facebook Messenger, Slack, Amazon Alexa, etc.
This Program Contains Many Useful Network Tools
MSN compatible messenger application
Instant Messenger Application
TorChat is a peer to peer instant messenger with a completely decentra
A small, reliable, local network messenger that doesn't need internet
Telegram Messenger
A small (ish) messaging server for anything you can think of