LAN Messenger is a p2p chat application for intranet communication and does not require a server. A variety of handy features are supported including notifications, personal and group messaging with encryption, file transfer and message logging.Discontinued
Sadly, no more releases since Dec. 2018
MyChat is an instant messenger that works in LAN and over the Internet. Reliable in slow connections. Do not require too many system resources. The program has its own server where a user control everything happening in the chat.
KouChat is a simple serverless chat client for local area networks (wifi). With KouChat you can communicate with other KouChat users, without configuring a server, or accessing the Internet.
Last release 1.1.1 is from August 2018.
LAN Messenger is a decentralized UDP IM-style chat client which supports usernames, guaranteed-delivery IMs, broadcast chat, encryption, file transfer, simple UI, persistent settings, and IP blocking.This app doesn't have any features at the moment.Discontinued
And almost as outdated as the original Lan Messenger. Last repo update from 2013.