General Actions:
SAC is a standard interface for CSS parsers.
Hibernate's Bean Validation (JSR-303) reference implementation.
A simple image gallery. Images are collected from the macro content and displayed using a slide-show view.
A collection of utility classes to ease usage of the repository system.
Plexus Component "Java 5" Annotations, to describe plexus components properties in java sources with standard annotations instead of javadoc annotations.
Javassist (JAVA programming ASSISTant) makes Java bytecode manipulation simple. It is a class library for editing bytecodes in Java.
Reliable cluster communication toolkit
The Codehaus is a collaborative environment for building open source projects with a strong emphasis on modern languages, focussed on quality components that meet real world needs.
Apache Lucene Java Core