Didactor is an Open Source E-learning environment, written in Java and built on top of MMBase (http://www.mmbase.org). Didactor consists of over 20 didactic components, like e-portfolio, assessment, competence management, group discussion, chat etc.
Duke is an IRC-bot framework based on PircBot library. It provides extensible IRC messages handling bus, made of modules integrated by Spring IoC container.
Extensible highly scalable ERP with encrypted XML backend; allows binding of any frontend (.NET,MONO,Java...).PlugIns:Contact management,disposition,invoices,reports,commAddon (e-mail,fax,TAPI,buddies,chat),osCommerce,StoreNuke, eBay,Amazon...
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The VilAug framework for visual linguistics! This gadget contains an IconNet with icons like WordNet and an IconMessenger as instant messenger. A new ontology is used, grammars for visual languages designed. A language with signs? Create it with VilAug.
obby4j is a pure Java implementation of the 'obby' protocol used by Gobby, a free collaborative editor supporting multiple documents in one session and a multi-user chat.
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 web based interface, configure bots to perform various tasks or custom behavior.
Dante is a Java-based Web-Application Framework which allows programmers to develop Web-Application like normal Swing-Applications. No HTML / CSS /JavaScript knowledge needed. It inlcudes a lightwight cms system with javaapplet based wysiwyg editor
a simple, extensible Instant Messenger TOC bot framework written in Java using Jaimlib 0.5 or greater. services for incoming IMs are created simply by implementing a handle() method, and sample handler code is included.
SquirrelTrivia is a Java and PIRC-bot-framework based IRC bot designed specifically for trivia, and plans to include public and private trivia, amd highscores. Attention: Now defunct, please see https://sourceforge.net/forum/forum.php?forum_id=781270
A chatbot framework currently implementing the ErkiTalk and irc protocol. By specifying parsers for the server's input one can easily create custom bots (if one can program in java of course ;).