LAN Messenger - LAN Messenger is a decentralized UDP IM-style chat client which supports usernames...
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.
Wrike - Wrike is a flexible, scalable, and easy-to-use collaborative work management software that helps high-performance teams organize and accomplish their work. Try it now.
Bopup IM Suite - Organize secure messaging system and communicate instantly via self-hosted IM server.
KouChat - KouChat is a simple serverless chat client for local area networks (wifi).
MyChat - Secure instant messenger for any network