dcm4che is a collection of open source applications and utilities for the healthcare enterprise. These applications have been developed in the Java programming language for performance and portability, supporting deployment on JDK 1.4 and up.
JDCM class library implements DICOM in a quickly and 100% pure JavaTM. It provides an implementation of all basic DICOM functionalities in a powerful and easy-to-use library API.
1T3XT offers a suite of products that are useful to create and/or manipulate documents, more specifically PDF and RTF documents. There's some support for XML and HTML, but this isn't the core business of iText.