IMPULS (Instant Messenger Personal User Log Storage) is a toolset which allows to retrieve, store and display messages from different IM instances in a central database.
JIB - Java IM Bot, aimed to built a pluggable,
customizable, expandable and dynamic bot framework for
instant messager. With JIB user can control remote IM Bots over webbased interface, configure bots to perform various tasks or custom behavior.
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
Csicq is a client-server application that will enable connecting to the icq network using a Java applet without, violating the applet's security restrictions. The server side uses icqlib to maintain connection with the icq network.
Everybuddy Java (EBJava) is a messaging system written in Java. It consists of an applet and a server, and is used to log in to existing messaging services (AIM, ICQ, etc) through a unified interface. User settings are also stored on the server.