Stikkit gives you the digital equivalent of a sticky note: the easiest thing you can grab to jot down an idea or reminder. As you type, Stikkit watches for appointments, to-dos, people, bookmarks and more, magically extracting and organizing the important

Really cool collaborative whiteboard application - Flash based

Looks like an interesting basic todo manager, it isn't Jira but it is free

Plone is powerful and flexible. It is ideal as an intranet and extranet server, as a document publishing system, a portal server and as a groupware tool for collaboration between separately located entities.

An unstructured way of organizing a conference or a set of meetings

Online calendaring and declarative programming

Lens building to provide relevant info on a topic