A lightweight peer-to-peer messaging program that runs in the console. It also has a GUI version. It is currently very early in development. It is implemented in Java, so it is cross-platform. Currently developed using Java 8 (aka 1.8) It is distributed under the 3-clause BSD license. Planned features in the future include message encryption and file transfers.
The most up-up-to-date source can be found on GitHub: https://github.com/cguy777/LiteMessage
The MTools library can be...
J.Jab. Lite is a lightweight Jabber client written as a Java 1.4.1 applet. Allows users to chat with others on Jabber, AIM, ICQ, MSN, and Yahoo im systems. Has a slimmed down version written in java 1.1.7 that allows simple group chat and moderator access