PlanetaMessenger.org is a Instant Messenger with support to all well known instant messenger networks including ICQ,MSN,AIM,Yahoo! and Jabber through a powerfull plugin engine. PlanetaMessenger.org support multiples look and feels, plugins and profiles.
OpenYMSG is an open source Yahoo Messenger API implementation. It began as a fork of jYMSG, primarily to upgrade the API. It is intended to get you up and running with a simple Yahoo Messenger client in very little time.
Java Instant Message (IM) Library, Client and Tools. Flexible framework to design your own. AIM, ICQ, Yahoo, MSN, Jabber, SMS, Nate, GoogleTalk. GUI, spell checking and more. Includes a web interface for remote/cell access. Mac, Win, Linux friendly
A web-based instant messenger client allowing you to connect to supported messengers (AIM, GTalk, MSN, Yahoo) via HTTP (or HTTPS). The Yafumato server connects to the messengers by proxy and provides a web interface, allowing IM access from anywhere.
Jasim (Just Another Simple Instant Messenger) is a simple instant messenger program written entirely in Java. Jasim will feature a protocol that can be extended through plug-ins. It will have a client library with full API documentation so that anyone wh