3D
Java3D, OpenGL, 6DX for Java, Anfy 3D, Direct3D interface wrapper plugin for Java and Ecl, Imaging the Imagined, jPCT, Jun for Java, Opale.Soya, SyGem Software
Charts
3D Multi Series Column Chart Bean, Big Faceless Graph Library, Chart2D, ChartDirector for Java, Charts Package - ILOG JViews Component Suite, Desai Technologies, EasyCharts, Enterprise Graphs and Charts, Express Chart, jCharts
Data Formats
Acme.JPM.Encoders.GifEncoder, BMP Reader, Gif4J, GIFOutputStream.java, How to read EXIF and IPTC with Java Image I/O API, IBM alphaWorks, ICOReader for the ImageIO API, ImageGear, ImageJ, ImageroReader
User Interface Classes
Layout Managers, Look and Feels, 3Magic Coffee Table, ActiveTree Inc., Advanced Swing Components (ASC Suite), BISS AWT, Desktop Extension (DesktopEx), Eltima Visual Java/SWING Components Library, Extreme Component, GroupingTable, Java Calendar Component, Java Candies
GEF - Graph Editing Framework
Class library for constructing graph/diagram editing applications. [Open Source, Apache]
GINY (Graph INterface librarY)
Implements a very innovative system for sub-graphing and allows for stunning visuals and it provide a number of layout algorithms. [Open source, LGPL]
HyperGraph
A Swing based API to visualise graphs using hyperbolic geometry (hyperbolic trees). Example applet provided. [Open source, GPL]
ILOG JViews
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.
Image Toolz
Manipulation methods for inversion, rotation, shifting, adding, loading, saving and creating images. (Open Source)
j-extreme
Free J/Carnac and J/View3D; INT's Java 2D and Java 3D graphics toolkits. [Freeware]
Java Image Visualization
Applets, beans and applications. [Freeware]
Java Imaging and Graphics Library
Provides classes for data storage, image processing, image I/O and image display [Open Source, GPL].
Java Vision Toolkit (JVT)
Library for machine vision and image processing applications [Open source, GPL].
Java-Gnome
Java GTK+ and Gnome bindings using JNI. [Open Source, LGPL]
JDrawing
A Swing component for displaying vector graphics and animation. It can deal efficiently with very large vector images e.g. geographic maps or electronic circuits.
JGo graphical object editor
A library for graphs, diagrams and networks, with an option for automatic layout by Northwoods Software. [Commercial]
JGraph
Graph visualization component for Swing. Includes tutorial, FAQ, and user guide. [Open Source, LGPL]
JInsight.com
Offers various class libraries including "JetChart Library", which displays a variety of types of charts. [Commercial]
JIU - Java Imaging Utilities
This library offers functionality to load, analyze, process and save pixel images. [Open Source, GPL]
JLOOX
JLOOX Visualization Suite is a powerful set of components and tools for the development of high quality Java-based visualization applications. JLOOXTelecom is a distributable component set that includes easy-to-use network oriented graphical views and non-graphical business components for building advanced Java-based network & element management systems and network planning applications.
Mica 2D Toolkit
A object-oriented 2D graphics library written in Java. [Open source, Software Farm license]
OpenJGraph
Various graph-drawing and traversal algorithms. Support for user interaction such as adding and removing vertices. [Open Source, GPL]
PJA Toolkit
For generating images on servers, without the need for an X server. [Open Source, GPL]
VirtualMachine.com
Utility class libraries: VMMemoryWatcher library that visually track memory changes in Java Virtual Machine; Flow monitor library that visually track process flow between containers. [Open source]
XColor
Subclass of java.awt.Color that knows 752 colors by name - can be substituted for wherever java.awt.Color is used in programs. [Freeware]
Zooki Technologies
ExplicitLayout layout manager (Commercial) and EventInitializer to replace your anonymous inner classes (BSD).