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Trace Modeler is an easy to use and smart editor for UML sequence diagrams... It instantly updates the diagram layout, freeing you to focus on the actual content... Ideal for documenting existing systems and brainstorming new designs.. And fast too!EventStudio System Designer 4.0 a use case and sequence diagram based systems engineering tool. With EventStudio, users model the system in a text based modeling language. EventStudio generates sequence diagrams from the model.