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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.
WebListManager is a browser based personal "to-do" list web application using Spring and Hibernate. Users can access their to-do lists from anywhere, home or office. A variety of views are provided to see the lists in helpful ways.