You can message and share files inside your intranet without a server.
A Windows client for the Direct Connect networks
Psi+ Project — development branch of Psi XMPP client
Development toolkit for Web Services and XML data bindings for C & C++
An OpenSource Chat Solution
We moved to GitHub! -> http://luadch.github.io/
unkown
A Work-In-Progress, Full-Featured, Open Source IRC Client
Chat Application and file sharing application
A messaging system designed for home use Created by: Chad Dunn
Underground IM is a free Java Instant Messaging solution.