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
MeetingPoint is a modular cross-browser realtime collaboration and conferencing environment. It provides Flash web meeting with audio/video conference, shared whiteboard and slideshow presentation, chat, polls, etc. Full Moodle integration.
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.
The Floranta libraries provide components for building Rich Client Wikis using AJAX or Java. Floranta clients can be embedded in any webpage (even plain html) and allow users to leave notes, images, cards, etc on the pages. Eg: http://www.floranta.com