jChart is a free Java library for drawing complex business & scientific charts. It may be used in Java applications and applets as a Swing-like GUI component, and also in servlets to publish the charts on the Web in several formats.
Visualization System is a server application for presenting and manipulating XML-based adapted multimedia data, useful eg. in mobile environement. It is component based framework for additional modules developement.
Infomap is a Javacomponent for displaying and manipulating nodal data. It gives the user the ability to visualize large graph or tree structures by means of expanding and collapsing portions of the structure and by easily zooming in and out.