Akeni LAN Messenger 1.2.27
This is a cross-platform instant messenger client.
It is a peer-to-peer program that works on your LAN without the need of an Internet connection or a dedicated server. The client has an user interface similar to AIM, ICQ or MSN Messenger. It supports all the standard IM features such as chat, group conference, presence management, file transfer and emergency alert/notification. Extra features include contact management and optional tabbed chat sessions.