DrawSWF
A drawing program to generate flash animations. [Open source, GPL]
Java Image Studio
Tool for operating system independent image editing. [Freeware]
JChemPaint
Java program to create 2D chemical diagrams. [Open Source, LGPL]
jPicEdt for LaTeX
A tool which allows you to draw pictures or graphs using LaTeX's own picture environment. [Open Source, GPL]
Meson Platform
Platform for the delivery of interactive 2D and 3D content within a lightweight Java applet.
Nonosee
An image viewer written in Java. You can customize it, add library, create filter, add a language.