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LAN Messenger - LAN Messenger is a decentralized UDP IM-style chat client which supports usernames...
Feem - Share files offline. No servers. No cloud. No limits.
BeeBEEP - You can message and share files inside your intranet without a server.
Squiggle - Squiggle is a free and open-source, peer-to-peer LAN messenger that is lightweight and feature-rich.
Winpopup LAN Messenger - Winpopup LAN Messenger is a cost-effective Office, Corporate, Enterprise Instant Messaging solution.
Output Messenger - Secure instant messenger app for office provides seamless instant messaging solutions for all office, corporate and enterprise business communication needs.