Java GTK+ and Gnome bindings using JNI. [Open Source, LGPL]

Class library for constructing graph/diagram editing applications. [Open Source, Apache]

Graph visualization component for Swing. Includes tutorial, FAQ, and user guide. [Open Source, LGPL]

Implements a very innovative system for sub-graphing and allows for stunning visuals and it provide a number of layout algorithms. [Open source, LGPL]

Various graph-drawing and traversal algorithms. Support for user interaction such as adding and removing vertices. [Open Source, GPL]

For generating images on servers, without the need for an X server. [Open Source, GPL]

Library and components based on Java2D for maps, diagrams, graph layout, gantt chart, charts, editors and workflow. For client or server side graphics, including SVG.

A Swing based API to visualise graphs using hyperbolic geometry (hyperbolic trees). Example applet provided. [Open source, GPL]

Offers various class libraries including "JetChart Library", which displays a variety of types of charts. [Commercial]

Generic 2D graphics library for Java. [Open source, LGPL]