Application: LAN Messenger
Description: (from website) LAN Messenger is a free and open source cross-platform instant messaging application for communication over a local network. It does not require a server. A number of useful features including event notifications, file transfer and message logging are provided.
Download LAN Messenger 1.2.35 Development Test 1 [12.4MB download / 40.2MB installed]
This app has now been officially released and is available from the official LAN Messenger Portable page.
Development Test 1 (2013-01-24): Initial release