Climax is a Java command line argument parser framework that allows you to create and customize your own command line interface. The command line help and version information can be customized using built-in Apache-Ant-like properties.
Tudu Lists is a J2EE application for managing todo lists. It's based on Spring 2.5, JPA/Hibernate and AJAX (using the DWR framework). It's a simple yet effective project management tool, and it is also often used as a sample Spring application.