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LAN Messenger - LAN Messenger is a decentralized UDP IM-style chat client which supports usernames...
BeeBEEP - You can message and share files inside your intranet without a server.
Softros LAN messenger - LAN messenger for an internal office chat for home or business users. It does not require a server and is very easy to install and use. It supports personal chats, group chats, message brodcasting, files transfer and remote desktop access.
Squiggle - Squiggle is a free and open-source, peer-to-peer LAN messenger that is lightweight and feature-rich.
MyChat - Secure instant messenger for any network
BORGChat - BORGChat is a LAN messaging software program.