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.
Raja: Ray-tracing application. [Open Source, GPL/LGPL]