You can message and share files inside your intranet without a server.
BeeBEEP is a secure (encryption based on Rijndael Algorithm, AES) peer to peer office messenger. You can talk and send files with all your colleagues inside a local area network such of an office, home or internet cafe without a server. BeeBEEP works also with VPNs. This serverless application is indispensable in all those places where privacy and security an essential requirement.
For more info visit: https://www.beebeep.net
EZ Intranet Messenger is designed to work within a LAN segment, without the presence of centralized server. Its primary goal is to provide instant messaging service, along with online status notification, file transmission, and real time public chat.
GTK+ port of EZ Intranet Messenger. It's decentralized nature makes it suitable for casual use at home, or within a small to medium size office. It is fully compatible with the Java Swing counterpart meaning that status changes, private messages, public chat, and file transmissions all work across the two types of clients.