Eclipse Plunging/UML

1. Borland Together Edition for Eclipse
   Borland Together Edition for Eclipse is an integrated and agile design environment that helps teams accelerate the development of higher quality applications combining the open-source Eclipse platform with the power of the Unified Modeling Language (UML).
   Borland Together Edition for Eclipse includes full support for IBM WebSphere Studio Application Developer.
                                   
2. ArgoEclipse
   ArgoEclipse integrates the best of ArgoUML, the oldest and best known open source UML modeling tool, with the power of Eclipse. Totally free and completely open source. If you're stuck with an earlier fork of the ArgoUML source such as the MyEclipse UML plugin and need a later version of UML, additional features, or bug fixes from the latest ArgoUML releases, this plugin is worth investigating. Recent releases have focused on improving interoperability with AndroMDA if you're an MDA aficionado.
                                                             
3. Relo - Relationship based Exploration
   Relo provides tooling for supporting developers understand parts of large codebases. It tracks developers explorations through the code base and build intuitive UML-like diagrams on-the-fly.
                            
4. ObjecteeringUML for Java Enterprise Edition
   Objecteering/UML for Java is a new "all-in-one" product package, based on the Enterprise Edition, specifically dedicated to Java developers wishing to use UML so as to provide easy access to a single environment combining the Eclipse IDE with model support and code generation. Also supporting design patterns, EJB generation and Java/EJB test generation, Objecteering/UML for Java automates and maintains the consistency of Java technology development work, at both the model and generated code and documentation levels.
                                                        
5. Hiber Objects
   HiberObjects makes it easy to design and unit test code for JPA or Hibernate. PropertyChange support and DTO's for Google Web Toolkit (GWT) can also be generated.
                  
6. UMLet - Fast UML Editor
   The free UML tool UMLet lets you draw UML diagrams with a light-weight, pop-up-free user interface. It lets you draw diagram sketches fast; export diagrams to eps, pdf, jpg, svg, and system clipboard; share diagrams using Eclipse 3; and create your own custom graphical elements.
                    
7. Violet UML Editor for Eclipse
   Violet is a UML editor with these benefits: very easy to learn and use, draws nice-looking diagrams, completely free. cross-platform. Violet UML Editor is intended for developers, students, teachers, and authors who need to produce simple UML diagrams quickly. It is fully integrated with Eclipse.
                                
8. Jupe
   Jupe is a UML Plugin for Eclipse. It provides support for the creation of UML class diagrams, Java code generation and reverse engineering. Jupe is based on the GEF and UML2 frameworks and supports Eclipse 3.2.
                      
9. Green UML
   Green is a LIVE round-tripping UML class diagram editor, meaning that it� supports both software engineering and reverse engineering of existing code. You can use green to create a UML class diagram from existing code, or to generate new code by drawing a class diagram.
                                      
10. MDWorkbench Free
    MDWorkbench Free (Model-Driven Workbench) is free Eclipse Plugin. It provides UML users with a powerful Eclipse-based IDE for code generation and model transformation, devoted to implement MDA strategies. Code generators are text template-based and can be built for any target architecture or framework.
                                                    
11. eUML2 Studio edition
    eUML2 for Java is a powerful UML modeler designed for Java developper in Eclipse to support huge-size projects and the collaboration of large team. It is a native Eclipse integration based on all Eclipse's frameworks such as EMF, GEF, GMF and UML2. Soyatec's goal is to promote Eclipse solutions, contribute the Java world and finallly provide an user-friendly and powerful tool to improve the productivity and software quality.
                      
12. IdafeUML
    IdafeUML is a set of tools for analysis and design of java software, using UML diagrams. Diagrams can mix reverse engineered objects and manual drawn objects. Diagrams linked to code can always be refreshed when the code changes.
                       
13. ObjectAid UML Designer
    The ObjectAid UML Designer is optimized for the quick and easy creation of UML class diagrams from existing Java source code and libraries. Code exploration is supported by seamless integration into the Eclipse IDE and many ease-of-use features.