iText is a free open source Java-PDF library released on SF under the MPL/LGPL; iText comes with a simple GUI: the iText toolbox. The original developers of iText want to publish this toolbox as a separate project under the more permissive MIT license.
FengGUI is a highly customizable, XML centric graphical user interface (GUI) application programming interface (API) based on OpenGL for Java. It addresses game and multimedia developers.
A Java software for 3D visualization of graphs/networks. It implements many graph layout algorithms (such as force-directed methods), graph generators (such as scale-free networks) and graph modifiers. Most functions can be accessed through its GUI.
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.