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JS/UML is a plugin for the Eclipse IDE that reverse-engineers JavaScript code to a UML model which can then be used to generate documentation and other artifacts.
PlantUml Dependency allows to parse / reverse engineering source files (only Java is supported by now) to generate a PlantUml description, allowing to draw the UML class diagram associated to the source code.
JSeqUnit enhances Javadoc documentation with UML sequence diagrams that are generated with the help of JUnit tests. It uses JSeq to trace the execution of test executions. It supports re-engineering of components through improved reverse engineering of methods with the help of sequence diagrams.
jUML is a UML diagram application capable of reverse engineering Java source code to create relationship diagrams, source code generation based on a user created UML diagram, and saving/restoring of jUML projects.