MyUML Designer is a free and powerful UML software modeling tool implemented according to the latest UML2.2 standard; integrated with and built on top of the Eclipse3.5 IDE.
The goal of the MyUML Designer project is to build a software modeling tool and also platform that is a compelling replacement of commercial UML tools such as IBM RSA, Together and so on.
It supports the most important UML diagrams:

1. Class Diagram
2. Object Diagram
3. Package Diagram
4. Component Diagram
5. Composite Structure Diagram
6. Deployment Diagram
7. Use Case Diagram
8. Activity Diagram
9. State Machine Diagram
10. Sequence Diagram
11. Profile Definition Diagram
12. Timing Diagram

Additional diagrams currently under development, making the UML modeling complete, will be included shortly:

1. Application Architechture Diagram
2. Technology Infrastructure Diagram
3. Service Oriented Diagram
4. MDA
5. Codegen(Java/C++/C#)

Additional features on top of the UML diagrams:
• Integrated with and built on top of the Eclipse3.5 IDE
• Automatically validates your design through its validation engine which checks all UML2.2 constructs
• Complete implementation of the UML2.2 specification; rich semantics of all UML2.2 elements and features, reflected in the diagrams