Axiis is an open source data visualization framework designed for beginner and expert developers alike. Built upon the Degrafa graphics framework and Adobe Flex 3, it provides a nice way for displaying clean charts.
Statistics "a la" Google analytics in real time. They also provide a rich client - erf, if a java application can stand for a "rich" client. They also provide the ability to "tag" a user in order to track its data all over the statistics interface.
