ADAMS is a workflow engine for building complex knowledge workflows.
ProStack - a platform for image processing and analysis
BRIC is a powerful tool for batch image processing.
GPU-accelerated image processing for java
Java source code for image processing books by Burger & Burge
Bildster is an image processing library for educational purposes.
Add watermark to any image or photo (batch processing available).
View and alter images (batch processing available).
iwatermark is a image watermarking web application.
An Image Processing Framework
A JBIG2 decoder written for Java under a BSD license