You can message and share files inside your intranet without a server.
Psi+ Project — development branch of Psi XMPP client
Development toolkit for Web Services and XML data bindings for C & C++
Chat Messenger. E-Mail-Client. Websearch. Filetransfer.
A SSH based chatroom.
Program for filesharing using Direct Connect and ADC protocols
Psi IM — Qt-based XMPP client
Low-latency, high quality voice chat for gamers
File sharing client with chat
[WARNING] Project has moved to http://github.com/Retroshare/Retroshare
err is a plugin based chatbot designed to be easily extensible
Chat inside a LAN (subnet).